Myth or fact: Some people are born with a sluggish metabolism.

Fact. That’s true, but it’s possible to beat your genes. The Pima Indians of Arizona have high rates of obesity and diabetes, but their genetic cousins in Mexico exercise more and eat fewer processed foods—and have healthier body weights. The key to revving your slow system, says Christopher Bell, PhD, assistant professor of health-and-exercise science at Colorado State University, is to eat small servings of healthy, whole foods and exercise regularly (both cardio and strength training).

By Sarah Elizabeth Richards