"Since insulin is known to promote cell division and enhance breast tumor growth in animal models, the Einstein scientists reasoned that relatively high insulin levels may contribute to breast cancer risk in women...(and)...Notably, the link between elevated insulin level and breast cancer was strongest among lean women and weakest among obese women (who, in general, have higher insulin levels compared with lean women). “This finding is potentially important because it indicates that, in postmenopausal women, insulin may be a risk factor for breast cancer that is independent of obesity,” says Dr. Kabat. However, because the number of lean women was small, this finding is preliminary."
The study included 5450 participants who were followed over eight years.
There are supplements that are useful in maintaining glycemic health; however, in all honesty, diet and lifestyle changes are critical if we moderns (too sedentary, too many yummy treats available) are to avoid insulin resistance issues.