If keeping the weight off feels harder than losing it, you’re not alone. There is a biological reason for that, and it plays a big role in healthy weight maintenance. Your body often tries to return to its old weight because it does not always like change. After major weight loss, your metabolism can slow down, a process called metabolic adaptation. This means you burn fewer calories at rest than someone of the same weight who was never overweight. Your body becomes more effi

The holidays and fattening food go hand-in-hand. Thanksgiving and the leftovers can last a week. Then it’s only a few more weeks until...