High circulating concentrations of insulin growth factor‐I (IGF‐I) is a risk factor for prostate cancer,2, 3 and some evidence indicates that proteins in the diet, especially from dairy products, may be related to higher circulating IGF‐I concentrations.4, 5, 6, 7, 8, 9, 10, 11, 12. Here, IGF1 is linked to Familial prostate cancer.