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Interesting doc why some people stay thin on excessive calorie diet.

https://www.youtube.com/watch?v=dAQr77QMJiw

I know their all ate SAD high fat diet. Study participants were normal weight, and then their doubled their normal calorie intake for 4 weeks. All gained weight some less some more. A guy who gained least amount of weight increased his BMR by 30%.

Also what is interesting that after returning to their normal calorie intake their lost their excess weight and returned to their normal weight.