You are a tall man. Statistically speaking, dear reader, you're probably not—but let's say that you are. You are tall, and though you carry a bit of extra weight around your midsection, you like to tell yourself that you're perfectly healthy. The last time you went to the doctor, she told your BMI is exactly average. You were glad, because it meant your health insurance rate wouldn't go up. And you were, to a lesser extent, glad that you weren't overweight, because goodness knows how many problems that causes. Your portly uncle died young from a heart attack. That's not the fate you want for yourself.