Enough people have asked me if the kind of cholesterol in egg yolks is good or bad (hint: it’s neither) that I think it is time for a brief tutorial on this misunderstood molecule.

Rather than put you to sleep with a watered down version of a Wikipedia article I decided to explain the interaction of diet and cholesterol in a short video. Hopefully this will help clear up what cholesterol is and how you should eat to minimize your risk of heart disease.

As always, feel free to drop me questions in the comments.

If you like this story follow me on the new Digg!

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Further reading:

• How To Raise Your HDL Cholesterol
• Intact Grains vs Whole Grains
• How To Make Eggs Taste As Good As Bacon
• Book Review: Good Calories, Bad Calories

Photo by Uwe Hermann

Refined sugars and high-fructose corn syrup are considered by many experts to be the biggest contributors to obesity and poor health in Western civilization.

In her book What To Eat, Marion Nestle, professor of nutrition at NYU and blogger at Food Politics suggests that any food that contains more than 15 grams of sugar per serving is closer to dessert than anything else. Though this number is arbitrary, it is a good benchmark for evaluating food products.

Obviously sugar content is not the only factor in a food’s nutritional value (and not all of these have added sugar), but it can be illuminating to see the relative amounts in the foods we consume.

Just for fun I looked up the sugar content of a few common foods and menu items. I hope you’re as horrified as I am.

Listed values are as close to a normal serving as I could approximate. Units are listed as grams of sugar.

Sugar Content of Common Food Products

1. Krispy Kreme original glazed doughnut …………………………………………………10 g

2. Luna Bar berry almond ……………………………………………………………………………11 g

3. Froot Loops breakfast cereal 3/4 cup ……………………………………………………12 g

4. Ben & Jerry’s vanilla ice cream ………………………………………………………………..16 g

5. Starbucks caffè latte grande 16 oz ………………………………………………………..17 g

6. Godiva 2 truffles ……………………………………………………………………………………….17 g

7. Subway 6″ sweet onion teriyaki chicken sandwich ……………………………….17 g

8. Ms. Field’s chocolate chip cookie …………………………………………………………….19 g

9. Tropicana 100% orange juice 8 oz …………………………………………………………25 g

10. Yoplait original yogurt ……………………………………………………………………………27 g

11. Craisins dried cranberries 1/3 cup ……………………………………………………….29 g

12. Vitamin Water 20 oz bottle ………………………………………………………………….33 g

13. Oscar Mayer Lunchables crackers, turkey & American cheese ………….36 g

14. Coca-Cola Classic 12 oz can …………………………………………………………………39 g

15. Sprinkles Cupcake red velvet ……………………………………………………………….45 g

16. California Pizza Kitchen Thai chicken salad ………………………………………….45 g

17. Jamba Juice blackberry bliss 16 oz ……………………………………………………….49 g

18. Odwalla SuperFood 450 ml bottle ………………………………………………………..50 g

19. Starbucks caffe vanilla frappuccino grande 16 oz ………………………………58 g

Take home messages:

• Foods we recognize as dessert (e.g. doughnuts, ice cream, cookies) often have far less sugar than things we consider “healthy” (e.g. juice, yogurt, dried fruit).
• Froot Loops aren’t necessarily better than doughnuts.
• Energy bars are glorified candy.
• Dessert is sometimes hidden in things like sandwiches.
• Some foods marketed to children aren’t much better than soda.
• A salad can have as much sugar as one of the biggest cupcakes I’ve ever seen.
• “Natural” foods can have lots of sugar.
• The worst offenders are drinkable.
• Starbucks is why you’re fat.

How much sugar is in your favorite foods?

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Dr. Andrew Weil is the father of integrative medicine and has one of the most sane and straightforward healthy eating programs available. Here he sat down with Kevin Rose and answered an extensive range of geek health questions asked by Twitter users.

The question I was most curious about is the role of dairy in health. I have done countless hours of research on potential links between dairy and prostate cancer, type 1 diabetes, osteoporosis, asthma and other problems, and was happy to see Dr. Weil’s interpretation of the data is very similar to mine (very little is conclusive). He also adds an interesting aside on the importance of Mongolian cows that you shouldn’t miss.

Other topics covered include the potential dangers of soda and energy drinks, the risks and benefits of soy, which supplements are worthwhile, the best sources of antioxidants, how much vitamin D is necessary, the importance of fish oil, the deal with cellphone radiation, screen time and eye problems, tea, chocolate, low-carb diets, depression and those “fancy detox kits.”

It’s an incredibly informative video and definitely worth a half hour of your time.

And don’t forget to follow @drweil and @kevinrose on Twitter.

Enjoy!

Photo by TheBittenWord.com

Chances are that if you do much cooking, especially during the winter, you rely on canned tomatoes as the base for many dishes. Canned tomatoes are one of the staples of my kitchen and I’ve recommended them many times as a good alternative to fresh winter tomatoes (yuck).

But recent reports indicate that the lining of most cans (including tomatoes, beans and soda) contain a resin that leaches a toxic chemical, bisphenol-A (BPA), into food.

BPA has been shown to be a neuroendocrine disruptor and causes several biological problems, especially during development. Outrage over BPA back in April 2008 led to massive changes in consumer demands about the safety of food containers, especially baby bottles and the then-popular Nalgene bottles.

Since publication of the The 7 Foods Experts Won’t Eat article in Shine, I’ve been bombarded with questions asking if it is still okay to eat canned tomatoes.

Here are my thoughts on canned tomatoes & BPA:

1. Canned tomatoes aren’t great, but soda is worse. In the article, Fredrick vom Saal, PhD, says that tomatoes are a particular problem in cans lined with resin because they are acidic, which increases the rate at which BPA enters food. He goes on to argue that this amount exceeds recommended doses and can “impact people.”

Since Dr. vom Saal studies BPA and I do not, I concede his point. But I think it is also important to consider the context of this argument. It is true that tomatoes are acidic, but tomatoes also have many health benefits and can be a valuable part of your diet.

I don’t drink soda (which is substantially more acidic than tomatoes) or eat canned beans, so tomatoes are the only canned food I eat. I also don’t eat canned tomatoes every day. I therefore question if the tiny, sporadic amount of BPA that I am exposed to through canned tomatoes has a real effect on my disease risk, given my healthstyle.

My guess is the risk is very small. If you do drink a lot of soda, however, you may have more to worry about.

2. Glass jars are a fantastic alternative. Home canning was all the rage this summer, and I’m sure those of you who produced gallons of home stewed tomatoes are feeling pretty awesome right now with your BPA-free stockpiles.

There is no way on earth I would have time for a massive canning project of my own, but fortunately there are some wonderful independent companies willing to do it for me and sell them to me as I need.

I have yet to try tomatoes from a glass jar, but my guess is they lack the metallic aftertaste of those in cans. As an experiment, I’ll make my next preserved tomato purchase from one of my favorite companies, Happy Girl Kitchen, to see if I can tell the difference. They are more expensive than the cans I normally get, but it might be worth it for the better flavor. You can also find their products at Foodzie.

Keep up with my foodie experiments on Twitter @summertomato.

3. I’m not a kid, but if you are you should be more careful. One of the biggest problems with BPA is its effect on children. Kids are small, so the amount of BPA they are exposed to pound-for-pound is relatively higher than it is for the rest of us. Children also metabolize (eliminate) BPA more slowly, so the toxins stay in their bodies longer. Lastly, during development certain organs are more susceptible to the effects of BPA, which may result in serious problems later in life.

In other words, BPA is substantially more dangerous for children than it is for adults.

So while BPA may be a mild concern for grownups with a basically healthy lifestyle, it may be worth keeping it out of your diet for the sake of the younger members of your family.

Conclusion

BPA in canned tomatoes is a legitimate concern. However unless you are a regular consumer or are under the age of 6, the long-term impact of BPA on your life is probably mild.

If you would rather be safe than sorry, glass jars are a fantastic BPA-free alternative that will probably improve the taste of your winter tomato dishes.

As for the other items on the list, I mostly agree with their conclusions. However the selection of these particular 7 things (as opposed to dozens of other problematic foods) seems rather random and arbitrary. In my opinion you will get much more out of shopping at the farmers market than you will from fretting over blacklisted foods.

What do you think about canned tomatoes and BPA? Did I answer your questions?

Today is my 30th birthday and a perfect time to reflect on life, the universe and everything.

Despite being female and thus held to tough and often unrealistic physical standards, hitting the end of my third decade doesn’t cause me anxiety about either my appearance or place in the world.

In my experience, age is not an amount of time but a state of mind. As a child I always wanted to be a grown up, so I acted like one. It freaked my parents out sometimes, but that’s just how I was. In my mind, I still feel pretty much the same in that regard. I love to work hard and I thrive in positions of responsibility. Since both these traits get more important with age, I have actually enjoyed stepping into the adult role I’ve always felt I belonged in.

But that’s only one part of me.

In many other ways I’m as juvenile as ever. If you spend much time with me on Twitter (@summertomato) you’ve probably noticed I have the sense of humor of a 12-year-old boy. I blame my dad for that one. I’m also still shocked every time I hear that friends my age are getting married and having children. In my brain we’re not nearly old enough for that yet! But in reality, it is my friends who are normal and I’m the outlier.

Oh, and did I mention I’m still in school? Up until a couple years ago I carried a backpack with me everywhere, for better or for worse.

All these things give me a sense of agelessness, so it is hard to think of this birthday as anything but another day to do things I love. But part of my peace of mind certainly comes from the fact that I’m in pretty good shape physically–probably the best of my life. And at 30 this is definitely something to be proud of.

Summer Tomato readers know I attribute my good health almost entirely to my eating habits. I also spend a good amount of time in the gym, though I don’t workout nearly as much as I used to. But healthstyle extends to more than just diet and exercise.

Here I’ve compiled my favorite 30 habits to slow aging and keep you young in more than just your heart.

30 Healthstyle Tips To Keep You Young

1. Be happy The physical damage caused to your body by stress has only recently become appreciated by the scientific community. Fill your life with things you love and get rid of almost everything else. Practice stress relieving activities like meditation and exercise, and learn to appreciate joy when you find it. Happiness does a body good.
2. Eat vegetables There is good evidence that oxidative damage caused by toxins and metabolism contributes to the aging process at a cellular level. Foods (but not supplements) high in antioxidants seem to protect us from oxidative stress.
3. Avoid sugar Sugar is a direct cause of aging and significantly reduces lifespan in organisms from yeast to primates. Not by a small amount either.
4. Moisturize The appearance of your skin is largely dependent upon moisture. Help it out by using moisturizers to keep your skin soft and hydrated. Work with a professional to determine what type is best for you.
5. Don’t raise your eyebrows Credit my mother for teaching me this one, it has been a lifesaver. As a kid she used to warn me about raising my eyebrows, saying it would give me wrinkles and I’d regret it. I thought she was crazy, but still learned to express myself without much forehead crinkling. As a result I have far fewer forehead lines than some people years younger than me.
6. Sleep For me the most important determinant of how I look (and feel) on a given day is how much sleep I get. Seven hours is my ideal, but everyone is different.
7. Eat fish Some evidence suggests that the omega-3 fatty acids found in fish are particularly beneficial to the skin.
8. Wear sunscreen I love the sun and spend as much time in it as possible, but I never walk out the door without sunscreen on my face. UV radiation from the sun damages your skin and promotes aging.
9. Don’t smoke Smoking is one of the easiest ways to look older than you really are and shorten your life at the same time. Avoid both primary and secondary smoke like the plague.
10. Step out of your comfort zone Mental exercise seems to be one of the key elements of quality aging, but this doesn’t mean you should sit around all day doing crossword puzzles. Neuroscientist and cognitive aging specialist Dr. Adam Gazzaley suggests going out of your way to challenge yourself mentally, doing things like traveling and learning new languages even over the age of 60.
11. Take vitamin D Some research suggests that vitamin D may be particularly important in slowing the aging process. The jury is still out on the value of vitamin D supplements for aging, but they seem to have enough other benefits that it’s worth the investment.
12. Eat fruit Like vegetables, fruits have an enormous amount of antioxidants and help with hydration. Vitamin C in particular is thought to benefit skin.
13. No foundation or powder makeup Generally I avoid putting any makeup directly onto my skin. I realize I have a very flexible work environment and this is not possible for every woman, but skipping the makeup does help maintain your skin’s hydration and elasticity. I do wear makeup occasionally, maybe once or twice per week. But in general I find that mascara and lip gloss are enough for most situations.
14. Hydrate Your skin is very sensitive to water levels. Stay hydrated by sipping water and eating fruits and vegetables throughout the day.
15. Whiten teeth I know this isn’t something you can find at the farmers market, but when you drink as much coffee and red wine as I do, minor (and admittedly superficial) fixes like teeth whitening can go a long way. If you don’t believe me, try and remember the last time you saw a 20-year-old with yellow teeth….
16. Wear sunglasses If you’re a happy person (and I know you are), your wrinkles will most likely be caused by smiling and show up predominantly around your eyes. Block out extra sun (and look super cool) by always wearing sunglasses when you go outside.
17. Eat beans and lentils Legumes are a fabulous source of minerals that can help keep your skin hydrated and looking young.
18. Tea Afternoon tea time is one of the greatest discoveries I’ve ever made. Not only is tea full of antioxidants and other cancer-fighting compounds, a midday break can be just what the doctor ordered to sip away stress.
19. Cardio I’m not the biggest believer in cardio exercise for weight loss, but it is still important for vascular health. Not to mention how awesome you feel after a good session. Cardio doesn’t need to kill you, but you should do it regularly.
20. Strength training Building strong, toned muscles is one of the most effective ways to look younger than your years. Ask anyone who looks fabulous and they’ll swear by strength training. A little goes a long way.
21. Eat intact whole grains Intact grains (not fake “whole” grains that are ground into flour) are an excellent source of vitamins, minerals and soluble fiber. They are also perfect fuel for those killer workouts.
22. Olive oil It is hard to think of something more versatile, healthy and delicious than olive oil. It breaks my heart that dietary fat got such a bad rap the past few decades, since the benefits of healthy fats like olive oil are innumerable. Fat isn’t just “not bad” for you, it’s essential.
23. Kill your television We all have things we enjoy watching (I’m partial to NBA championship teams), but if it takes up a significant amount of your time each week (>5 hrs) it may be time to reevaluate. How many years of your life do you really want to spend on your couch?
24. Don’t stuff yourself Cutting back on calories is the single most effective way to slow aging and extend life. I don’t advise starving yourself, but it’s a good idea to avoid overeating in any situation.
25. Eat nuts Nuts are the perfect snack food and are filled with anti-aging fats, vitamins and minerals. They are also great for suppressing appetite–just don’t eat more than a handful.
26. Avoid dairy Studies of aging skin have shown that milk and milk products are associated with acne, which can lead to scaring and age spots.
27. Avoid processed meats Processed meats are associated with many different health problems in humans. No need to get too hung up on this, but you may not want to eat deli meat every single day if you want to stay young.
28. No processed carbohydrates Just like sugar, processed carbohydrates are a direct cause of aging and disease. I eat these things occasionally, but don’t let it happen too often.
29. Coconut oil Fats come in all different shapes and sizes, and I try to incorporate a good mix of all of them. Medium-chain fatty acids like those found in coconut oil are starting to be recognized as important by researchers, but the evidence is limited. Coconut oil is also a healthy source of saturated fat for vegetarians. I always use coconut oil when cooking Southeast Asian food.
30. Red wine Red wine has a powerful anti-aging compound in it known as resveratrol. Though it is unlikely that the dosage of resveratrol in red wine is high enough to impact lifespan, drinking alcohol in moderation is also associated with decreased risk of heart disease and other vascular problems. Cheers!

Do you have any anti-aging secrets?

1 lb Fat

Last week the New York Times and many other reputable news sources reported on a Canadian study that claims people with a normal body mass index (BMI) had a slightly increased risk of dying over a 12-year period than those with a BMI in the overweight range (25-29).

The use of the phrase “overweight was protective” landed this article just a hair’s width from being labeled Summer Tomato’s B.S. of the week on Friday. An observational study cannot determine cause and effect, as implied by the word “protective.” This study does not prove that extra body weight protects against all cause mortality, and saying so is irresponsible.

Studies (and reporting) like this have instigated wide-spread confusion about health and body weight. First people are told they are too heavy and should lose weight for health, then in the same breath they are told a little extra weight might not be so bad.

What is the average person supposed to believe? How should we act?

If you want to understand the facts it important to know exactly what the data does and does not say. Indeed, some studies (including one on Japanese men reported in the same issue of Obesity) have reported lower or equal risk of mortality for people with an overweight BMI compared to people of normal BMI (18.5-24). However, this is not the whole story.

First, the alleged benefit of being overweight has only been found in older individuals and does not apply to healthy, young people. Second, although it appears in some cases that overall mortality may be reduced, disease incidence is notably higher in overweight individuals compared to people of normal weight.

To point, a study in the most recent issue of Obesity (same journal, 2 weeks later) examines the relationship of BMI with many measures of cardiovascular disease in healthy, athletic men. In this study, those on the lowest end of BMI in the normal range (18.5-22.5) had a much lower risk of dying from or developing cardiovascular disease than normal weight men with a slightly higher BMI (22.5-25).

Men with the lowest healthy BMIs also had lower risk of hypertension, lower cholesterol and half the risk of diabetes. While the length of this study was only 7.7 years (compared to the 12 years reported in the Times story), there were more than double the number of participants (28,776 vs. 11,834).

(Why did this story not make the news? My guess is that it makes for a less compelling storyline and people would rather not hear it.)

Mortality is certainly an important measure in any study, but it is arguably not the most relevant endpoint. Disease and excess body weight can severely impact quality of life, particularly for older individuals (as illustrated by another study in the latest issue of Obesity). While I cannot speak for everyone, it seems probable that quality of life is equally if not more important than longevity alone. Thus it is questionable how much stock to put into studies that ignore these other factors.

It is also critical to remember that BMI is a measure that was designed to describe people at a population level, not as individuals. While large cohort studies can tell us useful things about relative risk, they are not directly applicable to individual people.

The inconsistency of the data related to BMI and mortality may in fact be an indication of its inadequacy as a general measurement. Remember that BMI represents a ratio between height and weight, making it possible to compare people of various body sizes. Normalizing for height may, however, be deceptive.

Decades of data on caloric restriction consistently show that smaller body size (irrespective of body fat levels and, possibly, BMI) is associated with longer life and decreased risk of nearly all diseases. This is true in all animals from yeast, to worms and flies, to mice and monkeys. While humans are certainly different from all these model organisms, there is tremendous evolutionary precedent indicating smaller body size as the best for health.

The principle of parsimony tells us the simplest hypothesis–that smaller body size is beneficial–is probably correct. Substantial evidence must be accumulated before this hypothesis can be rejected, and I have yet to see that data.

Furthermore, while the research on the risk of overweight may be slightly ambiguous, the data on obesity is not. It is painfully clear that the dangers of obesity are profound and on par with those of smoking cigarettes. Overweight is a necessary step to becoming obese, and according to the National Population Health Survey nearly a quarter of Canadians who were overweight in 1994/1995 were obese by 2002/2003. Since overweight is still a substantial risk factor for becoming obese, misleading public health messages about the benefits of body fat are especially dangerous.

As a consumer of information, the most important thing you can do is be skeptical of what you read. Just because something is printed in the New York Times does not make it true. In fact, many of our most trusted sources of health information do not base their recommendations on rigorous scientific thinking, which is probably the reason for the health disaster we are currently facing.

Thanks to Jan from Quest for Health for sparking this discussion.

What does your gut tell you about the relationship between health and body fat?

Healthy eating can sometimes seem like a daunting task. You know you should be eating local, seasonal ingredients and lots of vegetables, but how do you know what to get? Once you have it, how do you cook it?

Enter iPhone. I can confidently say that my iPhone has made my life more convenient than any single electronic device since my first laptop. Sure plain cell phones are great, but honestly text messages annoy me more than they improve my quality of life.

An iPhone offers so much more than calls and texts, especially when you delve into the world of applications or “apps.” Apps are third party software programs that can be downloaded to your phone to perform specific (usually awesome) functions. Apps are what set iPhone apart from all other phones. Today I’m going to tell you about two apps in particular–Locavore and Epicurious–that can be used together to help you decide what to do for dinner.

Locavore ($3) is an app that finds all the farmers markets near you along with the produce in season in your area. It does this according to your physical location on earth using the built in iPhone GPS. Isn’t that brilliant? (Yes, I’m totally jealous that I didn’t make this app myself.)

I get questions every week about how to find a good farmers market in a given area. Honestly I had never had an answer much better than “Google it.” With Locavore’s “Markets” feature, you get a list of farmers markets in your area ranked by their distance to you. If you click on the market you want to visit it gives you all the essential information, such as what time of year it runs and its hours of operation. Locavore also allows you to browse by region (U.S. only) or specific food to find seasonal availability.

The farmers market information used by Locavore is from a website called Local Harvest. Even if you do not have an iPhone Local Harvest is a fantastic resource for finding farms, markets and CSAs near you. When you have located the market you would like to go to be sure to check near the bottom of the information paragraph for the last time the site was updated. In my experience farmers are not particularly tech savvy and often forget to update their websites. I always recommend calling before you go, just to confirm the market still exists and hasn’t changed its hours.

In the Locavore app, once you have found your market you can check the “In Season” feature. This will give you a list of items that are supposed to be in season in your area (information gathered from the Natural Resources Defense Council website).

Unfortunately, the list is more an approximation of reality than a true market browse through. I’ve been following my own market on Locavore since I first downloaded the app several weeks ago, and I’d say it is about 90% accurate. Definitely I have seen the list include some items that are not available and I would not expect to be available this time of year in my area (e.g. boysenberries). Also, my market is large and specialized enough that there are always unique finds that the NRDC does not know about.

You can, however, get an idea of items that should be easy to find. To avoid hunting down ingredients that may not be available, be sure to check the pie graph icons to the left of each item. These represent the number of months left until that specific vegetable or fruit goes out of season (again, this is approximate and depends substantially on the weather). If there is less than one month left, you probably shouldn’t plan your entire meal around that one ingredient since there is a good chance it won’t be there. If the pie is full (green), that means you can find the item year round in your area. In general, the Locavore produce list is fairly thorough and accurate and can be used to create a seasonal dinner menu.

One of the coolest features of Locavore is its connection to the recipe website Epicurious. If you find a seasonal ingredient you would like to try but need ideas on how to prepare it, simply click the item and a page will open to show you all the states it is available along with the its Wikipedia listing (in case you aren’t sure exactly what it is) and a link to Epicurious. If you follow the Epicurious link it takes you to a list of recipes using your ingredient. Click the dish that sounds the most delicious and get a complete recipe and shopping list. Use this to make sure you get all the ingredients you need at the market.

Conveniently Epicurious has its own app (free) if you already know the ingredient you want to use and do not need to find a farmers market. You can search by meal, event or specific ingredient, and create shopping lists for your favorite recipes. As you can imagine, I’m particularly fond of the “Healthy Lunches” option. Another bonus is the Epicurious app contains the entire contents of the Big Yellow Cookbook by Gourmet.

Overall Locavore and Epicurious are both fantastic apps for anyone interested in cooking local, seasonal meals. Together they are a powerful resource for finding ingredients and cooking the best seasonal meals possible.

Have you used either the Locavore or Epicurious iPhone apps?

Go Nuts!

Have you ever noticed that some of your strongest food memories are of rich, fat laden meals shared with family and friends? According to new research, this may not be a coincidence. A study published last week in the Proceedings of the National Academy of Sciences demonstrates that digesting fatty foods enhances memory consolidation using the same neural pathway as emotional learning.

This finding has far reaching implications for cognitive therapies to fight over-eating, but may also suggest new, easy to implement strategies for memory enhancement. Pistachios anyone?

In the study, rats being trained on memory tasks were administered a substance called oleoylethanolamide (OEA) that normally increases in the gut after the ingestion of dietary fat (not carbohydrate or protein). Several days later, the rats given OEA performed better on the tasks than rats that were not, demonstrating enhanced learning.

To determine the neural pathway involved in this effect, the researchers chemically blocked signaling in the region of the brain that receives neural inputs from the gut (solitary nucleus), which abolished the effect of OEA. Next they selectively blocked neural transmission between this region and another region of the brain that has been shown to be critical for emotional learning (amygdala). This also eliminated the memory enhancement effect of OEA, indicating that emotional memory and memory enhancement from fatty food ingestion share the same neural network.

These findings may partially explain the emotional component that is often associated with chronic over-eating, something that frequently involves learned habits triggered by emotional situations.

However, OEA does more than enhance memory. It is also critical in feelings of satiety after a meal (decreasing hunger) and has been implicated in controlling body weight. Is it possible this new information could be harnessed for the power of good?

Low-fat diets have proved to be a colossal failure for both health and weight loss, partially because they encourage over-consumption of starchy (usually refined) carbohydrates. Moreover, vegetable and fish oils are protective against many chronic diseases that plague Western culture. Regularly seeking healthy fats in your diet can help control hunger, promote weight loss and lower risk of disease. But it now seems that healthy fats could also be a useful tool in overcoming emotional eating, a problem more complex than the standard weight gain that comes from 21^st century living.

Another interesting corollary of this study is that fat (specifically oleic acid, a healthy fat found predominantly in olive oil and nuts) may enhance learning and memory. Since the benefits of OEA were only evident when it was administered at the time of or immediately after training, the next time you study or prepare for a presentation you might want to have some nuts around to snack on. Almonds, cashews, hazelnuts, macadamia nuts, peanuts, pecans and pistachios are highest in oleic acid.

Are you interested in foods that could provide cognitive enhancement?

3D Brain MRI

Last time I gave you a list of 10 people you can’t trust for diet advice, but many of you were left wondering who can you trust? As I alluded to before, it is extremely difficult to give a generic answer to this question because, frankly, there is no single group of people I can point to and say, “These people always do it right.” This is never true.

Where To Start

In the comments on Wednesday, reader Steve Parker M.D. (blogger and author of The Advanced Mediterranean Diet – visit his new Diabetic Mediterranean Diet Blog) said he mostly relies on primary scientific literature for his information. “Primary” literature is the original study where the actual scientific data is published and analyzed. This is very different from a newspaper article or press release (what a newspaper article is based on).

Without a doubt going straight to the source is the best way to get the facts regarding food, health and nutrition, and this is exactly what I do.

The Catch

It would be wonderful if we could all read the science directly and decide for ourselves how to eat for health and weight loss. But unfortunately, most people do not have access to these studies unless you are on a university campus or pay the exorbitant subscription fees (hundreds of dollars) for each individual scientific journal (there are thousands).

Moreover, unless you have extensive training in biological sciences (more than a bachelors degree), these papers will make no sense to you anyway. Some people try to get around this by reading only the abstracts, but reading an abstract to comprehend a scientific paper is like trying to understand a Seinfeld episode by reading the TV Guide (only more irresponsible).

This is the root of the problem.

Scientific experimentation and analysis is incredibly complex and requires decades of training. Therefore the general public needs the data translated into plain English and explained in simplified concepts. It is tempting to believe that anyone with the appropriate education and a knack for writing can provide this service, however the nuances of data interpretation make this very tricky business. It is frighteningly easy to spin ideas and make claims the data does not really support. This is even scarier when you think of health and how many lives are at stake.

The difficulties that arise from this issue are far reaching. At the most extreme, we have seen that research funded by industry is biased toward a favorable result for the company conducting the research.

Another potentially dangerous scenario is the misinterpretation of data by press rooms and journalists, who then translate these false ideas to a wide audience. Finally there are well-meaning people who do their best to alert the public to important health concerns, but simply misinterpret the science for one reason or another.

Who Is Qualified?

Scientists Although I myself may be biased, I am inclined to trust the opinions of well-respected (highly published) scientists in the field of food and nutrition. Luckily, several of these people have written wonderful books clearly explaining the basics of food and health. Although I am probably the only person under 50 to have ever read these books, they are wonderful resources that I recommend whole-heartedly.

Here are my favorites:

Eat, Drink and Be Healthy by Dr. Walter Willett

Mindless Eating by Brian Wansink

What To Eat by Marion Nestle

Smart journalists Despite my tirade above, scientists are not the only ones with good diet advice. Some journalists have the intelligence and tenacity to uncover all the necessary information and convey it to their readers. To know if you have found this kind of journalist you must read their work and make critical judgments about the logic and conclusions drawn from the data provided.

I have read more bad than good books by journalists, so please be skeptical of what you find. Note: extended book reviews are on the future agenda at Summer Tomato (for short summaries please read the captions under the books in the Summer Tomato Shop).

So far the most thorough analyses I have read from any journalist are the works of Michael Pollan. I also think the work of Gary Taubes is essential reading.

These are the best books on food and health ever written:

The Omnivore’s Dilemma by Michael Pollan

In Defense of Food by Michael Pollan

Good Calories, Bad Calories by Gary Taubes

Trained nutritionists and dietitians I have also been impressed by many of the nutritionists I have encountered (especially Dinneen at Eat Without Guilt – find her on Twitter @EatWithoutGuilt). Nutritionists and registered dietitians are specialized in nutrition, food and eating. These professionals are skilled at working closely with an individual to develop personal eating plans. Although they are not specifically trained to read and interpret scientific studies, their education ensures substantial familiarity with the literature on nutrition, putting them ahead of most medical doctors.

Conclusion

In general you should be more skeptical than accepting of diet advice–particularly if the recommendations sound very strange or unnatural to you. However there are many good resources if you are careful to choose them wisely.

I am always looking for more book recommendations. See what I have read in the Shop and leave your additions in the comments.

Thanks to everyone who has participated in this lively conversation!

Tapeworm Diet Pills

Throughout history there has never been a shortage of (bad) diet, health and weight loss advice. Everything under the sun has been called a weight loss cure at some time or another. And now that we are blessed with the amazingness which is the internet, snake oil is more abundant than ever.

So who should you listen to?

Most people I speak to are so cynical about health advice they ignore all of it completely and simply hope they are one of the few blessed with the genetics to withstand decades of smoking, poor diet and/or no exercise. They always point to a great aunt who smoked like a chimney and lived to 95. At least she enjoyed her life, right?

The problem with this approach is that the vast, vast majority of us are not blessed with these genetics (sorry, being related to someone with those genes has very little effect on your own personal chances). Also, even if you have the most resilient body in the world the only way to test it is to do an experiment on yourself: Eat whatever you want and maybe you’ll make it to 60 without a heart attack. Maybe you’ll make it to 80 without colon cancer. Or maybe not.

It is also important to consider that no matter how long you live you can improve the quality of that life by making better decisions about how you treat your body now. And contrary to popular belief, these choices need not sacrifice fun and enjoyment. I for one consider my healthstyle habits–fresh delicious food and regular workouts–the best part of my daily grind. By far. The trick is finding a personal healthstyle that makes your life better, not worse.

But if bad advice is so abundant who should you listen to? Who do I listen to?

As hard as I tried, I could not come up with a way to describe someone who can be trusted for diet advice. I wanted to say “scientists,” but I could think of too many examples (usually involving money) where this simply isn’t true. Instead it is easier to think about who cannot be trusted and why.

10 People You Can’t Trust For Diet Advice

1. USDA Sadly, the government agency that has been given the responsibility of establishing the dietary guidelines for the United States is the Department of Agriculture. As you can tell from its name, the responsibility of this organization is to protect the interests of American agriculture industries. It has a far lesser interest in public health. Dairy and sugar lobbyists are the reason we are told up to 55% of our total calories can come from these sources. Obviously the USDA recommendations were not based on the data that clearly describes these substances as dangerous. Stay away from the bizarre food “pyramid” on their website.
2. Food companies When KFC tells you their grilled chicken is healthier for you than their fried chicken, do you believe them? How about Yoplait’s yogurt? Companies trying to sell you something are notorious for twisting scientific facts to make you believe their products are healthy. Think twice before you believe them, history tells us it is more likely the opposite is true (remember margarine and fat-free cookies?).
3. Your mom Although your mother has more interest in your personal health than lobbyists and food companies, she has been subjected to the same deceptive nutrition advertisements as you. A tragic fact of the past 60 years is that our parents grew up learning in school what the USDA wanted them to learn: calcium does a body good, fat = bad health, protein = good health. But these things are not true, no matter how strongly your parents believe them.
4. Celebrities It is difficult to look at a beautiful person and not believe they are doing something right or know some secret to perfect health. But just like your great aunt, celebrities have many advantages you probably don’t have that make their looks deceptive: genetics, time and money. These people make a living off looking beautiful and have all the resources in the world to achieve it. If they claim to have some secret to health or weight loss, chances are it is not something that will be effective in the long-term for a normal person. Even more likely is that they are being paid to sell you something.
5. Athletes If you are not a professional athlete or Olympian, chances are you do not have the same metabolism or dietary needs as someone who is. As much as I loved watching Michael Phelps win 8 gold medals, I am not going to start eating like him.
6. Cardiologists (or any M.D. with no research experience) Cardiologists are highly trained doctors that specialize in disorders of the heart and blood vessels. But while heart disease is strongly tied to diet, cardiologists are not necessarily trained in science or nutrition. I do not wish to take anything away from what these individuals do–most are incredibly talented, skilled professionals. However medical school and residency training focus more on treatment than prevention. Moreover, science (Ph.D.) and medicine (M.D.) are different, and few doctors have the time or training to keep up with and evaluate nutrition science. But some certainly do, and it is worth it to find out who. Another thing to consider is that heart disease is only one chronic disease related to diet. If you are worried at all about cancer, stroke, diabetes or Alzheimer’s disease would you ask a cardiologist?
7. Main stream media We all love a good story and journalists are trained to sell them to us. But very few journalists–even science writers–have more than a bachelors degree in biology or other hard science. This, of course, is less than the doctors I mentioned above. Though journalists are often very intelligent and can do a great job of analyzing the available scientific evidence (Michael Pollan comes to mind), even my beloved New York Times can drop the ball on nutrition science on occasion. When push comes to shove, they are more trained in story telling than scientific analysis.
8. Personal testimony We are all impressed by the person who lost 200 lbs on the Biggest Loser, and I salute anyone who has ever achieved substantial weight loss. But all diet advice from these people should be taken with a grain of salt. Personal testimony is the ultimate in non-scientific fluff (check out any website selling diet pills). In science a personal testimony is called N=1 and is proof of absolutely nothing. These people may be a great source of moral support, but real evidence and facts have numbers and statistics tied to them.
9. Natural health “gurus” Cynicism about health, medicine and science frequently cause people to turn to “alternative” solutions that often involve “natural” remedies. I would never suggest that natural solutions might not be the best path to health, but something being “natural” is not a guarantee of any particular benefit. In my experience, advice from natural health “gurus” is often based on poorly designed, poorly controlled studies that do not stand up to rigorous scientific testing. That does not mean these methods will never be proven effective, but keep in mind that most of them never will.
10. Personal trainers The gym is one of my favorite places in the world, and if I need help with a certain exercise I ask a personal trainer. Most trainers have (hopefully) gone through a (fairly easy) certification program where they learn the basics of body mechanics. They are not scientists and are not trained in nutrition.

I am not suggesting that these people contribute nothing to our conversation about diet. However you should always be skeptical of who you take your advice from, particularly when it comes to your health.

Is there anyone you would trust for diet advice?

Read my answer….
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