43tweaker wrote: @O'Dell -
Have you ever watched Biggest Loser and seen weeks where the trainers beat the calories out of those people who are subsisting on little more than asparagus for hours and hours. Some weeks you will see a person lose nothing or even gain after all that. If calories in/calories out were true; that couldn't possibly happen. . . So, how can a no loss week happen if calories in/calories out is true???
As you say, it is not that simple. What you are not accounting for is the impact of water retention. As has been posted many, many times, when you exercise, broken down muscles retain water. It is very easy to burn more calories than you take in and gain weight - water weight.
Even people who are totally fasting - ie no calories in at all - hit periods where they do not lose weight. The time frames are not long, but they are there.
Over time, however, it is calories in, calories out. If you eat fewer calories than your actual, honest TDEE, you have to lose weight. If you don't over the shorter term it may be because you are retaining water. If you don't over the longer term, it is because you are eating too many calories.
