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But the way the Biggest Loser contestants go about losing weight is CRAZY in my opinion. Creating a 3500 cal deficit per day?! Of course your body fights back against that, it's not a huge surprise. You do a starvation diet & your body concludes its starving? Shocking.
How about doing the same study, but this time of people who lose weight sanely? Would you get the same result? Smarter, I think, to study the metabolism of people who lose weight with a whimper, not a bang. And to study people who successfully keep the weight off.
I'm sorry that happened to you.
But there are people who lose weight successfully and maintain that loss. They are tracked in the National Weight Loss Registry. What I'm saying is that *those* are the people who should be studied.
People in the National Weight Control Registry are studied, a lot. A tiny proportion of dieters (about 1 in 100,0000) are in the National Weight Control Registry. And, there is evidence that people who make it into the National Weight Control Registry are physiologically different than other dieters. Most dieters experience a drop in body temperature when they diet, which means their body is conserving energy by not generating heat. But most dieters in the National Weight Control Registry have normal body temperatures -- this means their bodies do not conserve calories to a normal extent. And, you know what? At least one-third of the people in the National Weight Control Registry gain the weight back within a few years of joining the Registry, even though it's easier for them to keep weight off than it is for normal people. And, they are kept as members of the Registry even after they gain the weight back. So, the number of people in the National Weight Control Registry is exaggerated, because many of them have regained the weight.
The truth is, for most fat people, the only thing that might make you lean is bariatric surgery. (I wanted bariatric surgery, but my insurance wouldn't pay for it. Now I'm too sick to be a candidate.) No matter what diet you do, no matter how hard you try, the weight comes back. The drive to regain is based on
how much weight a person has lost, no matter
how they lost it.
I am furious at being told that my weight problems are my fault. When I have gone on low-carb diets and the diet has failed, people say it's my fault because I should have gone on a low-fat diet. When I have gone on low-fat diets and the diet has failed, people say it's my fault because I should have gone on a low-carb diet. If I eat 1600 calories a day and don't lose weight, I get some people telling me it is my fault because I am eating
too much, and other people telling me it is my fault because I am eating
too little. (I even had one idiot online who said I wasn't losing weight because my diet wasn't strict enough. I pointed out that I was famished, day and night, and he said, "Oh, I guess you aren't losing weight because you are eating too little." So,
the same person said both that I was eating too much and that I was eating too little. I am not making this up.)
This study on Biggest Loser contestants provides some new data, but there are many other studies, in both humans and animals that point to the same thing. Almost all people (and other mammals) have a weight setpoint that their bodies vigorously defend. Get much (maybe 5-10%) below that set point, and the body fights to gain the weight back. Here is an excellent study demonstrating this in rats:
http://ajpregu.physiology.org/content/287/2/R288.long
A few people are physiologically different, and do not defend their setpoint. For example, anorexics behave pretty much the same as normal-weight bulimics. But anorexics' bodies don't fight back when the person tries to lose weight.
I am sick of how some lean people constantly brag about what a great lifestyle they have, how much exercise they do and how great they eat. I have done the same things. My lifestyle as a young child was pretty much ideally designed to promote leanness (my parents wouldn't have had it any other way) and I was still fat. And when I tried really hard as an adult, it didn't make me lean -- it made me sicker.
People who are lean are
luckier than people who are fat, not more virtuous or deserving than fat people. I would never talk about people with brain cancer and brag about how my lifestyle is better than theirs and say that is why they have brain cancer and I do not. But my metabolic problems are life-threatening, and yet I face this sort of blame every day.
Some of the comments on this thread are excellent examples of how people refuse to believe the evidence that weight is biological, not behavioral. If even the most successful dieters gain the weight back, dieters who were so exceptional that they actually won a reality TV shows for their weight loss? People will just say they did it wrong.
I often feel like I am arguing with people who won't believe the earth revolves around the sun. And yet it moves.