Hormonal

Loss-of-function mutations in the Melanocortin-4 Receptor (MC4R) gene cause obesity with variable, age-dependent penetrance, where the likelihood of developing obesity increases significantly with age and across generations due to environmental factors.

If you have a known MC4R loss-of-function mutation, you cannot rely on 'willpower' or educational advantages to prevent obesity. Your risk increases with age and exposure to modern food environments. You must proactively manage your environment (food access, activity levels) starting from childhood and continuing into adulthood, as the genetic risk is not static but accumulates over time.