Losing weight to most wrestlers means that they will wrestle in a weight class where their size gives them at least a partial advantage. Afterall, being larger than someone else in a combative sport is an advantage. But only to a certain point, and only if the weight lost is weight that is not essential to one performing well. Too many times, especially at the year's end, during the tournaments that mean the most to wrestlers. There's just something goofy here.
Some wrestlers actually begin to detest wrestling after a couple of months.
It's hard enuf getting thru the season without losing weight. There are other issues. When you are losing weight, your attention span decreases. In some cultures, where lack of nutrition is a way of life, the illness and disease is much more rampant. Sometimes, absolutely, yes.