Once you lose weight, you lower your risk for all sorts of illnesses, including heart attack
, stroke, type II diabetes, etc. But if you lose weight
only to gain it all back again, you actually increase your risk of these issues AND each time you put on the weight, the harder it is to lose it. In addition, the older you get, the harder it usually is to lose weight -- you are at the perfect age to get it off in a reasonable manner and be able to keep it off, by making good lifestyle changes.