Girls who eat peanut butter or nuts regularly may be less likely to develop breast cancer.
Washington University researchers looked at the eating habits of more than 9,000 girls nine to 15 years old. Then, they followed up with them when they were between 18 and 30 years old.
Researchers say girls who ate peanut butter or nuts two times a week were 39 percent less likely to have developed benign breast disease by the age of 30 than those who never ate them.
Benign breast disease is non-cancerous, but can increase the chance of breast cancer later in life.
Complete findings for this study are in the Journal "Breast Cancer Research."