Pre-pubertal girls aged 6 to 14 were interviewed to determine their diet, physical activity, and family history. This information was updated annually for 3 years. After adjusting for other variables, girls who consumed an average of at least 25 grams of fiber per day were only 54 percent as likely as their matched peers to have an early first period. Early age at first period results in greater estrogen exposure for girls, which can have long-lasting effects, such as increasing the risk of breast cancer as an adult.
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