"Weight changes are not only characteristic of midlife or menopause. Data have shown that weight gain starts early in adulthood," Dr. Hurtado says. "Around age 30, your muscle mass starts decreasing ...

You're in your mid-40s, eating healthy and exercising regularly. It's the same routine that has worked for years. Yet lately, the number on the scale is creeping up. Clothes fit differently. A bit of ...