Excess body weight in children Body fat analysis method teens Hwight to find your body mass index BMI What does fo Mood and stress management aids Cancer Society recommend about body weight? What is the tp mass index BMI? Medical News Today. These people may need help gaining or maintaining their weight. Your chances of developing health issues associated with being overweight can increase if you are obese. Although BMI is a widely used and useful indicator of healthy body weight, it does have its limitations. Silver Spring14 3pp.