Will You Fill Out This Paleo Diet Survey?

This week, I received an e-mail from a graduate student at Humboldt State University named May Patiño.  She asked me to share her online research survey targeted to Paleo dieters.  Here are the goals of her research, in her words:

The main objective of my study is exploring how the Paleo diet is being implemented in practice.  I would like to assess the health outcomes of these practices, as well evaluate how closely they conform to, or deviate from ways this diet is being described in theoretical literature, and implemented in controlled diet trials. I also want to be able to use the data collected to help explain what is driving the popularity of the ancestral health movement. Ultimately, I would like this information to be used to better inform protocols for controlled diet trails.

The survey took me about 40 minutes to complete.  You're welcome to participate whether or not you're on the Paleo diet.  Please consider taking the survey, for the love of science!

Research Survey: The Paleo Diet in the US

That Time I Ate Most of a Large Pizza in One Sitting

Two weeks ago, I had a brush with Extreme Eating.  My experience illustrates some important principles of how the brain regulates appetite and body fatness-- and how it reacts to calorie-dense, highly rewarding foods.


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Out for Two Weeks

I'll be out of town with limited internet until September 27th.  Feel free to leave comments, but I won't be able to moderate them until I return.  Sorry for the inconvenience!

How Much Does Sugar Contribute to Obesity?

Last week, the British Medical Journal published a review article titled "Dietary Sugars and Body Weight", concluding that "free sugars" and sugar-sweetened beverages contribute to weight gain.  But what are "free sugars", and why does the scientific literature suggest that the relationship between sugar intake and body weight isn't as straightforward as it may initially appear?

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More Thoughts on the Recent Low-fat vs. Low-carb Metabolic Ward Study

The recent low-carb vs. low-fat study has provoked criticism from parts of the diet-health community.  Let's examine these objections and see how they hold up to scientific scrutiny.
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A New Human Trial Undermines the Carbohydrate-insulin Hypothesis of Obesity, Again

The carbohydrate-insulin hypothesis of obesity states that carbohydrates (particularly refined carbohydrates and sugar) are the primary cause of obesity due to their ability to increase circulating insulin, and that the solution to obesity is to restrict carbohydrate intake.  Numerous studies have tested this hypothesis, more or less directly, in animals and humans.  Despite the fact that many of these studies undermine the hypothesis, it remains extremely popular, both in the popular media and to a lesser extent among researchers.  A new human trial by Kevin Hall's research team at the US National Institutes of Health offers very strong evidence that the carbohydrate-insulin hypothesis of obesity is incorrect.  At the same time, it offers surprising and provocative results that challenge prevailing ideas about diet and weight loss.

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Refined Sugar Worsens Blood Lipid Markers of Cardiovascular Disease

Blood lipids such as LDL and HDL cholesterol are markers of the biological processes that impact cardiovascular disease, and they are commonly measured to assess cardiovascular risk.  When we think about the impact of food on blood lipids, dietary fat typically comes to mind.  Yet a new study shows that dietary carbohydrate, specifically high-fructose corn syrup, can have a large impact on blood lipid markers of cardiovascular disease risk.

Introduction

Dietary fats have well-established impacts on blood lipids.  For example, in short-term feeding trials, saturated fat tends to increase total cholesterol, increase LDL ("bad") cholesterol, and increase HDL ("good") cholesterol, while the omega-6 polyunsaturated fat linoleic acid decreases total cholesterol and decreases LDL cholesterol.  For this reason, dietary advice to reduce cardiovascular risk tends to focus on dietary fat.

The hypothesis that refined dietary sugar is harmful to the cardiovascular system isn't new.  In 1972, British physiologist and nutrition researcher John Yudkin published a classic book called Pure, White, and Deadly, which argued, among other things, that refined sugar is harmful to the cardiovascular system.  Yet at the time, the supporting data were weak, and the hypothesis was never taken very seriously by the scientific community.

Peter Havel and his group at UC Davis have begun to breathe new life into this hypothesis with their rigorous work on the cardiovascular effects of dietary sugars.

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What Properties Make a Food "Addictive"?

Although the concept of food addiction remains controversial, there's no doubt that specific foods can provoke addiction-like behaviors in susceptible people.  Yet not all foods have this effect, suggesting that it's related to specific food properties.  A new study aims to identify the properties that make a food "addictive".

Introduction

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Food Reward Friday

This week's luck winner... soy sauce!!

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Food Reward Friday

This week's lucky winner... the Pizza Hut Hot Dog Bites pizza!!!

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Insulin Resistance Predicts a Variety of Age-related Diseases

In the last post, I reviewed a study by Gerald Reaven's group showing that insulin resistance strongly predicts the risk of cardiovascular disease over a 5-year period.  In 2001, Reaven's group published an even more striking follow-up result from the same cohort (1).  This study shows that not only does insulin resistance predict cardiovascular disease risk, it also predicts a variety of age-related diseases, including hypertension, coronary heart disease, stroke, cancer, type 2 diabetes, and even overall mortality risk.

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Insulin Resistance Strongly Predicts Cardiovascular Disease Risk

I recently came across a very interesting paper by the research team of Gerald Reaven, an endocrinologist at Stanford.  He has long been one of the leading researchers studying insulin resistance, the metabolic syndrome, and their association with obesity.  Reaven's research, and that of many others, suggests that insulin resistance is a central part of the constellation of metabolic disturbances that are so common in affluent nations*.  We also have good reason to believe that it contributes to cardiovascular risk.

All the way back in 1998, Reaven's group published a paper that should raise the eyebrows of anyone interested in cardiovascular health (1).

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Food Reward Friday

This week's lucky "winner"... Hardee's Most American Thickburger!!

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Recent Interviews

Here are two recent interviews I'd like to share with readers:

Danny Lennon of Sigma Nutrition

Danny Lennon is an evidence-based nutrition coach who publishes a podcast called Sigma Nutriton Radio.  We had a nice conversation about why we overeat, including energy homeostasis and the personal economics of food choice.  The podcast has a high production value.  You can listen to the interview here.

Angelo Coppola of Latest in Paleo

Angelo Coppola and I hit it off recently due to our mutual interests in gardening and self-reliance.  We recently had a nice conversation about hunter-gatherer dietary patterns, the personal economics of food choice, US diet history, legumes and the Paleo diet, and how much meat we should eat.  You also get to hear a personal story about the only existing video of me as a child (that I'm aware of).  This one also has a high production value.  You can listen to it here.

New Study Strengthens the Case that LDL Causes Heart Disease

There is little remaining doubt in the scientific/medical community that high levels of LDL, so-called "bad cholesterol", cause heart disease.  Yet in some alternative health circles, the debate continues.  A new study adds substantially to the evidence that LDL plays a causal role in heart disease.

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Do Slower-digesting Carbohydrates Make Us Feel More Full?

One of the most common pieces of advice in the health-nutrition world is that we should focus our carbohydrate intake on slowly-digesting carbohydrates, because they make us feel more full than rapidly-digesting carbohydrates.  Rapidly-digesting carbohydrates, such as potatoes, stand accused of causing us to overeat, resulting in obesity, diabetes, and many other chronic ailments.  Is this true?
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Food Reward Friday

This week's "lucky" winner... bacon fried Oreos!!

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My Buddy and Me

Warning -- Satire -- April Fools Post

I have a sheepish confession to make: until recently, I had a tapeworm, and that's why I'm lean.

In 2006, I took a trip to Mexico with a few friends.  We often traveled through rural areas, and of course sampled the local cuisine wherever we went.  In many parts of Mexico, pork is an important food.  Some of it may have been a bit undercooked.

At the time, my interest in food and health was growing, and I was making many changes to my diet.  I was glad to see the chubbiness around my neck and waist begin to disappear.  The diet was working!  Or so I thought...

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Is Meat Unhealthy? Consolidated links

Several people have asked for a consolidated list of links to my series on meat and health.  Here it is!  This should make it easier to share.  

Is Meat Unhealthy?  Part I.  Introduction and ethical/environmental considerations.

Is Meat Unhealthy?  Part II.  Our evolutionary history with meat.

Is Meat Unhealthy?  Part III.  Meat and cardiovascular disease.

Is Meat Unhealthy?  Part IV.  Meat and obesity risk.

Is Meat Unhealthy?  Part V.  Meat and type 2 diabetes risk.

Is Meat Unhealthy?  Part VI.  Meat and cancer risk.

Is Meat Unhealthy?  Part VII.  Meat and total mortality.

Is Meat Unhealthy?  Part VIII.  Health vs. the absence of disease.

Is Meat Unhealthy?  Part IX.  Summary.

Food Reward Friday

This week's lucky "winner"... a bacon hot dog donut, by Krispy Kreme!

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