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> Then I went to Kauai for a week and gained 10 pounds

Is probably ~8lbs water. I'd be amazed if someone could gain 10lbs of fat in a week. That clocks in at about 50k total calories?




It was water and glycogen.

When I'm running low carb (for whatever reason) and have a carb refeed, I routinely gain 8-10 pounds in a 24 hour period.

Same for people making a weight for powerlifting/boxing/wrestling. They manipulate their water/salt, getting all the glycogen out of their system before reintroducing them to "pump" them back up etc etc


The rule of thumb is 3500 kcals / lb. So 10lbs of fat would be nearly 35,000 kcals, a daily net caloric surplus (not caloric intake, surplus) of 5,000 kcals.




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