Have you asked yourself this question? Declining health and/or obesity at 30 is NOT primarily a result of the “Freshman 15” or having “slowed down” in your 20’s. Admittedly, post below is a rather exaggerated case, however the point should not be missed. Good (or bad) health at middle-age and beyond is a direct result of the lifestyle/eating habits that are taught (and modeled) from birth to 15 more than any other factor. It is during these years that you are quite literally training your body and brain as to how it should allocate the energy resources you provide to it.