A high BMI is often an indicator of which condition?

A high Body Mass Index (BMI) is primarily an indicator of obesity because BMI specifically measures body fat based on an individual's weight in relation to their height. When BMI values are elevated, they suggest that a person has excess body fat, which classifies them as overweight or obese. Obesity is linked to various health issues such as diabetes, heart disease, and certain cancers.

In contrast, the other conditions listed do not have a direct correlation with high BMI. Osteoporosis is characterized by weakened bones and low bone density, which can affect individuals with various body types, not just those with high BMI. Anemia denotes a deficiency in red blood cells or hemoglobin, often unrelated to one's weight. Dehydration involves insufficient body fluids and can affect individuals irrespective of their body fat percentage or BMI. Thus, the choice that correctly associates a high BMI with a health condition is obesity.