My metabolism has slowed significantly over the past decade, which is a good thing. My body burned sugar too fast and I needed to eat constantly so I would not pass out. It kept me athletic and trim. With my metabolism slowing, life has become easier, but I have added about 5 pounds, even while improving my eating and exercise.

Bottom line, everyone is different. We process food differently, respond to exercise different, and age differently. The principles of good health however remain: good diet, regular exercise, and smart life decisions (smoking, stress, drugs, etc.).