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army1987 comments on Akrasia and Shangri-La - Less Wrong
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Some of us do believe in it since we are able to stay very thin without trying. I have never dieted and never needed to.
But, we probably don't post very much on diet blogs.
I come from a family of thin people who eat fairly unhealthily but are quite active. When I first stopped living with my parents, I basically stopped exercising and ate even more unhealthily. I became very unfit in the sense of e.g., not being able to run a block without getting out of breath, but gained very little weight. So I figure the causation is probably not mainly exercise -> thinness, but more on the lines of genes -> (thinness & athleticism) or genes -> thinness -> athleticism.
Which ought to be nearly obvious to anyone who has compared the calorie expenditures of common physical activities with the calorie contents of common foodstuffs. (Yes, increasing muscle mass increases thermogenesis (but so does caffeine) and I personally feel that doing abs help me feel less hungry because they kind of compress my stomach (but so does wearing higher-rise trousers and pulling their belt tighter), but those are second-order effects.)
This is also observed when wearing back-braces and corsets over the long term. In the corset-wearing/waist-training community particularly, some people have observed that without significant changes in behavior, corsets may decrease appetite; the actual effect is of course highly variable, but it's frequent enough to be conventional wisdom in that community, so.