<<<Let us consider a sample set of 100 subjects. The above means that only 10-20 of them are able to maintain their weight loss after 5 years. If yes, what does maintain a fat loss of 5% mean? So assume a guy loses 100 lbs so maintain a fat loss of 5% means he will gain back 95lbs?>>>
No you need to look at the graph. It shows that around 65% of people maintained a weight loss of 5% or greater. The leaves 35% who did not. You are confusing "fat" loss with "weight loss". They are not always the same. If a guy lost 100 pounds, he would probably have been in excess of 250 pounds. The hundred pound weight loss would then have been at least 40%. If he regained weight to 5% loss, he would then have regained 87.5 pounds, leaving him at 237.5 pounds, which is 5% less than 250 pounds. If he started out at 300 pounds, the 100 pound weight loss would have been 33.3%. If he regained weight to 5% loss, he would then have regained 85 pounds, leaving him at 285 pounds, which is 5% less than 300 pounds.
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