This study investigates the relationship between childhood obesity and the risk of obesity in young adulthood, as well as the influence of parental obesity. The research followed 854 subjects born between 1965 and 1971, analyzing their childhood and adult body mass index (BMI) and their parents' BMI. Childhood obesity was defined as a BMI at or above the 85th percentile for age and sex, while adult obesity was defined as a BMI of 27.8 for men and 27.3 for women. The study found that the risk of obesity in adulthood was significantly higher for children who were obese during childhood, especially if they had at least one obese parent. For example, children who were obese at 10-14 years of age and had at least one obese parent had a 79% chance of becoming obese adults, compared to 8% for children who were obese at 1-2 years of age without obese parents. After adjusting for parental obesity, the odds ratio for obesity in adulthood associated with childhood obesity ranged from 1.3 to 17.5, depending on the child's age. The study also found that parental obesity more than doubled the risk of adult obesity among both obese and nonobese children under 10 years of age. The results suggest that parental obesity is an important factor in predicting the risk of adult obesity, especially for older children. The study emphasizes the importance of early intervention to prevent obesity in children, particularly those with obese parents. The findings highlight the need for public health strategies to address childhood obesity and its long-term consequences.This study investigates the relationship between childhood obesity and the risk of obesity in young adulthood, as well as the influence of parental obesity. The research followed 854 subjects born between 1965 and 1971, analyzing their childhood and adult body mass index (BMI) and their parents' BMI. Childhood obesity was defined as a BMI at or above the 85th percentile for age and sex, while adult obesity was defined as a BMI of 27.8 for men and 27.3 for women. The study found that the risk of obesity in adulthood was significantly higher for children who were obese during childhood, especially if they had at least one obese parent. For example, children who were obese at 10-14 years of age and had at least one obese parent had a 79% chance of becoming obese adults, compared to 8% for children who were obese at 1-2 years of age without obese parents. After adjusting for parental obesity, the odds ratio for obesity in adulthood associated with childhood obesity ranged from 1.3 to 17.5, depending on the child's age. The study also found that parental obesity more than doubled the risk of adult obesity among both obese and nonobese children under 10 years of age. The results suggest that parental obesity is an important factor in predicting the risk of adult obesity, especially for older children. The study emphasizes the importance of early intervention to prevent obesity in children, particularly those with obese parents. The findings highlight the need for public health strategies to address childhood obesity and its long-term consequences.