What factors can influence a person’s body-mass index, categorizing them as obese?

Body mass index (BMI) is a measure used to classify individuals into categories such as underweight, normal weight, overweight, and obese based on their height and weight. A variety of factors contribute to a person’s BMI, and among these, nutrition and physical activity are particularly significant.

Proper nutrition involves consuming a balanced diet that meets an individual's caloric needs while providing essential nutrients. Poor dietary choices, such as high-calorie and low-nutrient foods, can lead to excess weight gain and influence BMI. Similarly, physical activity plays a critical role in managing weight; regular exercise helps burn calories and maintain a healthy weight. Thus, the combination of what one eats and the level of physical activity directly impacts body composition and overall health.

While genetics, social factors, and age can also impact weight and BMI, they do not act in isolation. Nutrition and physical activity are the primary modifiable lifestyle factors that individuals can control to achieve and maintain a healthy BMI. This makes them crucial in discussions around obesity and health management strategies.