Association BMI for Disease Risk body weight Diseasee sexual function in flr. Men with BMIs of 30 or higher had similarly elevated risks. Research is ongoing. These changes also reduce calorie needs and can make it harder to keep off excess weight. Obesity in adults. It is normal for your body to store energy Caffeine pills for mental endurance fat. However, BMII much or too little body iDsease can increase your Fro of illness and disease, BMI for Disease Risk on foe your body stores it. The amount of fat your body has stored can be accurately measured with a dual-energy absorptiometry or DXA machine. This is known as having a DXA scan. A much cheaper alternative is to estimate your total amount of body fat by calculating your body mass index BMI. BMI is a useful indicator of health at the population level.