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by convexfunction
1434 days ago
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The article says the low BMI people ate "12% less food" (presumably that's measured in calories), though it may not be fully true that they're "less hungry". There's a very common tendency to assume that the satiety response is based on how many calories you eat, but perhaps unless you're actually starving, it mostly isn't! Primarily, you feel sated when your stomach is or has recently been full of food, but that's based more on the mechanical stretch of the food on the walls of your stomach than anything else (cf. laparoscopic bands and gastric bypass being incredibly effective at causing morbidly obese people to lose weight -- they're literally just making the stomach effectively smaller). There's certainly some truth to "running hotter" as well, at least in some of those subjects, but I'll bet that many of them are habitually eating a less energy-dense diet than heavier people, rather than feeling less hungry for any more innate reason. Dietary energy density has been investigated in lots of experimental and observational studies and found to do an overall very good job of predicting current BMI, long-term weight loss, and in metabolic ward experiments, ad libitum caloric intake. |
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They are not that effective. the weight loss is often not enough or the weight returns. Gastric bypass, which is a major operation, will seldom make a very obese person thin and the weight tends to slowly return.