Nearly but they really think the answer is MORE DRUGS.

Prediagnostic body-mass index, plasma C-peptide concentration, and prostate cancer-specific mortality in men with prostate cancer: a long-term survival analysis
This provides further impetus for men to avoid becoming overweight and to decrease their risk of metabolic syndrome by physical activity and diet. So you're probably right

Second, our data suggest that the recent progress in prostate cancer control might have been attenuated by the increased prevalence of obesity and hyperinsulinaemia. It also adds to the rationale for investigation of new therapeutic and prevention strategies, such as use of insulin-lowering or antidiabetic drugs and new agents that target the insulin/insulin-like growth factor-1 receptor family as an adjuvant therapy for prostate cancer.

God forbid that anyone should suggest one could lower insulin by simply stopping eating those foods that raise insulin.
What profit would there be in doing that?
People could stop eating insulin raising foods for nothing and then where would we be?