Also, there is often an assumption that athletic performance equals good health. This assumption is often false. For instance, many of the players in the NFL qualify as obese by BMI standards, when they actually fall on the far end of the curve for body size, and could not easily fit into the healthy categories, despite being very physically active and having normal body fat percentages. This does not seem to protect them from health issues associated with obesity, such as increased risk of heart disease and diabetes.