Forget BMI as a risk factor for heart attacks. A new study published in the Lancet shows that when other factors are are taken into account, the body mass index (BMI) is irrelevant as a predictor for heart attacks, but that the ratio of your waist to hip measurements gives an excellent warning of your risk.

Divide your waist measurement by your hip measurement. If you are a man, and the result is under 0.90 you are not at risk, if you are a woman, the factor to beat is tougher- you need to be under 0.85 to be considered healthy.