1 of 4
Your Thighs!
A recent Danish study shows that people with thighs less than 24 inches around face a higher risk of heart disease and premature death, even if their body mass index (BMI) is normal. Not only do model-skinny thighs mean less muscle mass (which may mean the body is less able to regulate insulin levels), but some scientists hypothesize that thigh fat acts as a "metabolic sink," flushing the blood of harmful triglycerides (which raise your risk of cardiovascular ills).