Help your daughter maintain healthy weight from babyhood. No soda, no cookies on a daily basis: avoid canned and packaged goods with added sugar; emphasize raw fruit and vegetable choices, as well as nuts and seeds. Women who are overweight have a far higher risk for breast cancer than other women.

Pubmed Article: Associations of obesity and circulation of insulin and glucose with breast cancer risk: a Mendelian randomization analysis. Shu, X et. al., Int J of Epidemiology. 2018 Oct 1