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Portion control. Output > input = weight loss
https://www.msn.com/en-us/health/nutrition/man-who-ate-only-mcdonald-s-for-100-days-completes-challenge-and-drops-58-lbs-i-feel-amazing/ar-AA1bZtGx?ocid=msedgntp&cvid=5c44bebd91d64acbae926cb3f7c0d500&ei=8
This is consistent with my experience.
I’m a naturally skinny guy, but weighed 20-30 lbs more in college than I do now because I ate until stuffed.
I often richer food these days too (butter, fatty meat, etc.) - but cook most things from scratch.
That much weight loss that fast would be a very painful process. In no universe did he feel great while doing it. The McDonald’s thing is a nice gimmick and I guess it got him to go viral, so well played.