All of the options you provided play a role in determining a person's weight:
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Heredity: Genetics can influence body weight, fat distribution, metabolism, and overall susceptibility to weight gain or loss.
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Activity level: The amount of physical activity a person engages in can significantly impact their weight. Regular exercise can help maintain a healthy weight, while a sedentary lifestyle can contribute to weight gain.
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BMI (Body Mass Index): While BMI itself is a measurement that uses weight and height to categorize individuals, it is often used as an indicator to assess whether a person is underweight, normal weight, overweight, or obese. However, it does not directly determine weight; rather, it provides a statistical measure.
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Body composition: This refers to the proportion of fat and non-fat mass in the body. It can provide insight into a person's weight relative to muscle and fat distributions, which is important for understanding overall health beyond just weight.
In conclusion, heredity, activity level, and body composition are key factors that influence a person's weight, while BMI is a relevant measure related to weight assessment.