Mysteries of Energy Balance and Weight Loss

How to Lose Weight Effortlessly

You've probably seen this claim many times: a pound of fat contains 3,500 kilocalories (kcal).  A slice of toast is 80 kcal.  All you have to do is forego one slice of toast per day-- just a few percent of your total calorie intake-- and you will lose 8.3 lbs of fat per year.  Fat loss is so easy!

This reasoning is extremely common both in the popular media and among researchers.  Here's an example from the book Mindless Eating, by researcher Brian Wansink:

...the difference between 1,900 and 2,000 calories is one we cannot detect, nor can we detect the difference between 2,000 and 2,100 calories.  But over the course of a year, this mindless margin would either cause us to lose ten pounds or to gain ten pounds.  It takes 3,500 extra calories to equal one pound.  It doesn't matter if we eat these extra 3,500 calories in one week or gradually over the entire year.  They'll add up to one pound.

This is the danger of creeping calories.  Just 10 extra calories a day-- one stick of Doublemint gum or three small Jelly Belly jelly beans-- will make you a pound more portly one year from today.  Only three Jelly Bellys a day.

According to this reasoning, if I reduced my calorie intake by 80 kcal per day, I'd become skeletal in two years and vanish in a puff of smoke within 10 years*.  All from a meager 3 percent reduction in calorie intake! 

What's wrong here?

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NutriScience Seminar in Lisbon with Lindeberg, Fontes, and Bastos

My friend Pedro Bastos has asked me to spread the word about a seminar he's organizing in Lisbon titled "Evidence and Evolution-based Nutrition".  It will include Staffan Lindeberg, Maelan Fontes, and Pedro Bastos-- three quality researchers in the area of evolutionary health-- I'm sure it will be interesting.  Here's the flier:

 

 

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Public Talk at the University of Virginia on Friday, January 17

This Friday, I'll be giving an invited lecture at the University of Virginia, my undergraduate alma mater.  I was kindly invited by a medical student named Robert Abbott, and it worked out well because I was already traveling to Charlottesville.

The talk will be titled "Why Do We Overeat?  A Neurobiological Perspective".  Here's the teaser:

Obesity is a leading cause of morbidity and mortality in industrialized nations, yet this is a relatively recent phenomenon.  In the United States, increasing obesity prevalence has paralleled a gradual increase of daily energy intake.  Why do most Americans eat more than we used to, and more than we need to maintain a lean state, despite negative consequences?  This presentation will touch on the neurobiology of action selection, the neurobiology of energy homeostasis, and why our central nervous system hardware may not be up to the task of constructively navigating the modern food environment.

The talk will be attended by medical students, but I also hope to have some doctors and researchers show up, as well as people from the broader Charlottesville community.  It will be a thought-provoking talk regardless of your background, and it will touch on some of my own work.

The talk will be held in the main medical school auditorium, MEB 3110, on Friday, January 17 at noon.  You can find driving directions and parking information by following this link.  You'll probably have to park in a parking garage, either the Lee Street or Central Grounds garage (directions in the link).

For a map of the UVA health system, follow this link.  The Medical Education Building is number 44 on the map, and the talk will be in room MEB 3110 on the 3rd floor of the building.

See you there!

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Free e-Book and Ideal Weight Program 2.0 Announcement

I'm happy to announce that we're releasing a free e-book titled Why do We Gain Fat, and How do We Lose it? An Introduction to the Science of Body Fat, by Dan Pardi and myself. This is a slimmed-down version of the longer, fully referenced e-book we offer as part of the Ideal Weight Program. In it, we provide a succinct overview of the science of body fat gain and loss, and the evidence base for our program.  It also contains a schematic that ties together the various concepts in visual form. You can download it from the Dan’s Plan site by following this link to our program overview page.

Ideal Weight Program 2.0 Upgrades

Over the last year, Dan and I have been working hard to improve the Ideal Weight Program, both in response to user feedback and our own ideas for development.  Here are some of the new features we offer in 2014:

1. Four-week meal plans and shopping lists for the FLASH diet and the Simple Food Diet, as requested by Ideal Weight Program users.  This is in addition to the recipes and cooking guides we already provide.  
2. The Protein Unit system.  Research suggests there's an optimal amount of protein for appetite control and fat loss, depending on your height, weight, gender, and physical activity level.  Our fat loss diets are high in protein, but how do you know you're getting the right amount?  We've created a calculator that does it for you automatically, and explains how to apply your personalized Protein Unit value easily and intuitively using real food. 
3. Diet plates.  These are visual guides to following our diets, based loosely on the intuitive USDA MyPlate design.  
4. Cheat sheets.  Put these on your fridge to remind yourself of your diet and lifestyle guidelines, and daily protein unit goal.
5. Updated guidance.  We've refined a few things in the diet guidance documents. 

At a time of year when many people want to shed excess holiday pounds and start down a leaner, healthier path, we offer the Ideal Weight Program 2.0.  The program comes with a 30-day no-questions-asked refund policy so you can try it without risk.  We think you'll love this program, but if it doesn't work for you, we're happy to refund your purchase price. 

Financial disclosure: I receive a portion of the revenue from the sale of the Ideal Weight Program.  I do not receive revenue from the sale of other products associated with Dan's Plan or the Ideal Weight Program (such as the Fitbit, cooking tools, and other programs).

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Does the Vitamin and Mineral Content of Food Influence Our Food Intake and Body Fatness?

The Claim: We Overeat Because Our Diet is Low in Vitamins and Minerals

We know that animals, including humans, seek certain properties of food.  Humans are naturally attracted to food that's high in fat, sugar, starch, and protein, and tend to be less enthusiastic about low-calorie foods that don't have these properties, like vegetables (1).  Think cookies vs. plain carrots.

In certain cases, the human body is able to detect a nutritional need and take steps to correct it.  For example, people who are placed on a calorie-restricted diet become hungry and are motivated to make up for the calorie shortfall (2, 3).  People who are placed on a low-protein diet crave protein and eat more of it after the restriction is lifted (4).  Humans and many other animals also crave and seek salt, which supplies the essential minerals sodium and chlorine, although today most of us eat much more of it than we need to.  At certain times, we may crave something sweet or acidic, and pregnant women are well known to have specific food cravings and aversions, although explanations for this remain speculative.  Research suggests that certain animals have the ability to correct mineral deficiencies by selecting foods rich in the missing mineral (5).

These observations have led to a long-standing idea that the human body is able to detect vitamin and mineral (micronutrient) status and take steps to correct a deficit.  This has led to the secondary idea that nutrient-poor food leads to overeating, as the body attempts to make up for low nutrient density by eating more food.  In other words, we overeat because our food doesn't supply the micronutrients our bodies need, and eating a micronutrient-rich diet corrects this and allows us to eat less and lose body fat.  These ideas are very intuitive, but intuition doesn't always get you very far in biology.  Let's see how they hold up to scrutiny.

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Food Reward Friday

This week's lucky "winner"... peanut M + M's!!!

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Does "Metabolically Healthy Obesity" Exist?

Obesity is strongly associated with metabolic alterations and negative health outcomes including diabetes, cardiovascular disease, and some types of cancer (1, 2, 3, 4).  Excess body fat is one of the primary causes of preventable health problems and mortality in the United States and many other affluent nations, ranking in importance with cigarette smoking and physical inactivity.  Obesity is thought to contribute to disease via the metabolic disturbances it causes, including excess glucose and lipids in the circulation, dysregulated hormone activity including insulin and leptin, and inflammatory effects.  This immediately raises two questions:

1. Does metabolically healthy obesity exist?
2. If so, are metabolically healthy obese people at an elevated risk of disease and death?

Does metabolically healthy obesity exist?

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Food Reward Friday

This week's lucky "winner"... Oreo cookies!!!

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Beans, Lentils, and the Paleo Diet

As we continue to explore the foods our ancestors relied on during our evolutionary history, and what foods work best for us today, we come to legumes such as beans and lentils.  These are controversial foods within the Paleolithic diet community, while the broader nutrition community tends to view legumes as healthy.

Beans and lentils have a lot going for them.  They're one of the few foods that are simultaneously rich in protein and fiber, making them highly satiating and potentially good for the critters in our colon.  They're also relatively nutritious, delivering a hefty dose of vitamins and minerals.  The minerals are partially bound by the anti-nutrient phytic acid, but simply soaking and cooking beans and lentils typically degrades 30-70 percent of it, making the minerals more available for absorption (Food Phytates. Reddy and Sathe. 2002).  Omitting the soaking step greatly reduces the degradation of phytic acid (Food Phytates. Reddy and Sathe. 2002).

The only tangible downside to beans I can think of, from a nutritional standpoint, is that some people have a hard time with the large quantity of fermentable fiber they provide, particularly people who are sensitive to FODMAPs.  Thorough soaking prior to cooking can increase the digestibility of the "musical fruit" by activating the sprouting program and leaching out tannins and indigestible saccharides.  I soak all beans and lentils for 12-24 hours.

The canonical Paleolithic diet approach excludes legumes because they were supposedly not part of our ancestral dietary pattern.  I'm going to argue here that there is good evidence of widespread legume consumption by hunter-gatherers and archaic humans, and that beans and lentils are therefore an "ancestral" food that falls within the Paleo diet rubric.  Many species of edible legumes are common around the globe, including in Africa, and the high calorie and protein content of legume seeds would have made them prime targets for exploitation by ancestral humans after the development of cooking.  Below, I've compiled a few examples of legume consumption by hunter-gatherers and extinct archaic humans.  I didn't have to look very hard to find these, and there are probably many other examples available.  If you know of any, please share them in the comments.

To be clear, I would eat beans and lentils even if they weren't part of ancestral hunter-gatherer diets, because they're inexpensive, nutritious, I like the taste, and they were safely consumed by many traditional agricultural populations probably including my own ancestors.

Extensive "bean" consumption by the !Kung San of the Kalahari desert

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Recent and Upcoming Appearances

Smarter Science of Slim

Jonathan Bailor recently released an interview we did a few months ago on the neurobiology of body fat regulation, and the implications for fat loss.  It's a good overview of the regulation of food intake and body fatness by the brain.  You can listen to it here.

Super Human Radio

Carl Lanore interviewed me about my lab's work on hypothalamic inflammation and obesity.  I'm currently wrapping up a postdoctoral fellowship with Dr. Michael Schwartz at the University of Washington, and the interview touches on our recent review paper "Hypothalamic Inflammation: Marker or Mechanism of Obesity Pathogenesis?"  Dan Pardi and I are frequent guests on Carl's show and I'm always impressed by how well Carl prepares prior to the interview.  You can listen to the interview here.

The Reality Check podcast

Pat Roach of the Reality Check podcast interviewed me about the scientific validity of the "carbohydrate-insulin hypothesis" of obesity.  The Reality Check podcast "explores a wide range of controversies and curiosities using science and critical thinking", and a dash of humor.  This one should be very informative for people who aren't sure what to believe and want a deeper perspective on the science of insulin and body weight regulation.  You can listen to it here.

Obesity Society conference

Next Thursday 11/9, I'll be speaking at the 2013 Obesity Society conference in Atlanta.  My talk is titled "The Glial Response to Obesity is Reversible", and it will be about my work on the reversibility of obesity-associated hypothalamic neuropathology in mice.  My talk will be part of the session "Neuronal Control of Satiety" between 3:00 and 4:30, specific time pending.  See you there!

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Buckwheat Crepes Revisited

One of my most popular posts of all time was a recipe I published in 2010 for sourdough buckwheat crepes (1).  I developed this recipe to provide an easy, nutritious, and gluten-free alternative to flour-based crepes.  It requires no equipment besides a blender.  It's totally different from the traditional buckwheat crepes that are eaten in Brittany, in part because it's not really a crepe (I don't know what else to call it, maybe a savory pancake?).  I find these very satisfying, and they're incredibly easy to make.  They're especially delicious with fresh goat cheese, or scrambled eggs with vegetables, but they go with almost anything.  Chris Kresser also developed his own version of the recipe, which is fluffier than mine, and more like a traditional pancake (2).

Buckwheat is an exceptionally nutritious pseudograin that's rich in complete protein and minerals.  In contrast to most whole grains, which have low mineral availability due to phytic acid, buckwheat contains a high level of the phytic acid-degrading enzyme phytase.  This makes buckwheat an excellent source of easily absorbed minerals, as long as you prepare it correctly!  Phytase enzyme works best in an acidic environment, which may be part of the reason why so many cultures use sour fermentation to prepare grain foods.  My original recipe included a sour fermentation step.

But there's a problem here.  Buckwheat doesn't ferment very well.  Whether it's because it doesn't contain the right carbohydrates, or the right bacteria, I don't know, but it spoils rapidly if you ferment it more than a little bit (using a strong sourdough starter helps though).  Others have told me the same.  So here's my confession: I stopped fermenting my buckwheat batter about a year ago.  And it tastes better.

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New Post on Eat Move Sleep Blog

Yesterday, the Dan's Plan blog Eat Move Sleep published a blog post I wrote about sleep, artificial light, your brain, and a free computer program called f.lux that can help us live healthier lives.  Head over to Eat Move Sleep to read it.

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Sleep and Genetic Obesity Risk

Evidence is steadily accumulating that insufficient sleep increases the risk of obesity and undermines fat loss efforts.  Short sleep duration is one of the most significant risk factors for obesity (1), and several potential mechanisms have been identified, including increased hunger, increased interest in calorie-dense highly palatable food, reduced drive to exercise, and alterations in hormones that influence appetite and body fatness.  Dan Pardi presented his research at AHS13 showing that sleep restriction reduces willpower to make healthy choices about food.

We also know that genetics has an outsized influence on obesity risk, accounting for about 70 percent of the variability in body fatness between people in affluent nations (2).  I have argued that "fat genes" don't directly lead to obesity, but they do determine who is susceptible to a fattening environment and who isn't (3).  I recently revisited a 2010 paper published in the journal Sleep by University of Washington researchers that supports this idea (4).

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