10 Tests to Take by 30

Yes, fat can kill.

Obesity is a primary risk factor for everything from heart attack to dementia, and one of the few you can manage. An important first step is to find out your body mass index, or BMI. It's a concrete indicator of your overall health status and can help you achieve and maintain a healthy weight.

BMI determines body fat based on an individual's height and weight and can help identify your risk level for many health problems. It's calculated by dividing your body weight by the square of your height.

The World Health Organization says that a BMI of 25 or greater is considered overweight; above 30 signifies obesity. Underweight is below 18.5