Okay so I have seen the first 2 episodes of “The Biggest Loser” if you don’t know it’s a show were 2 teams of overweight people compete to see which team can lose the most over all weight. The first show the people were losing up to 22 lbs and this is in a week. Now I know from health class that most of that weight lost was not fat and probably water and so I expected this week that they wouldn’t be losing as much weight.
This week they got on this giant scale and found out they lost 1 and 2 pounds but one guy got on the scale and had gained 4 pounds.
Keep in mind that he was on a reduced calorie diet and exercised every day like the rest of them. Assuming that he never got off of his diet and always worked with the trainer then how could he gain any weight?
Some people didn’t lose any weight but I could understand that somewhat because maybe their body was holding on to the fat but could someone explain how you can gain weight when you have been exercising and dieting a whole week?
Also I learned that the whole thing about gaining muscle makes you gain weight is untrue but maybe it is true.
Thanks for your responses 
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What if his metabolism went into “famine mode” when he cut his caloric intake? He could eat less and still gain weight.
My guess, for the people that gained no weight or the guy that gained a few pounds, was that they lost some fat, but gained some muscle. Muscle does weigh more than fat, and in the span of two weeks with heavy exercise, it’s conceivable that enough muscle formed to offset the loss of fat.
If most of his weight loss the first week was just water, he may have not been so dehydrated the second week.
Dehydration (and bowel movements) can come into play. When I played football, the coach had us weigh in before and after practice. I remember I used to lose 5 lbs of sweat during one practice. Therefore, with human weights, there is at least a 5 lb margin of error… if weight difference are less than 5 lbs, the difference is not significant.
This one really big, really strong guy on the team lost 9 lbs in one practice.
You take in and excrete a lot of water in a day - according to the guy who wrote “The Hacker’s Diet” (freely available online if you care to google it), it’s about nine pounds per day altogether. So a difference of four pounds isn’t really a difference at all.