Research shows that the tested hypothesis is probably skewed and has not been clinically proven but there is evidence that we have too much exposure to chemicals, hormones and processing.
Food is responsible for physical changes. Our bodies must evolve to adapt to changes in our environment, including water, food, and air. Also more girls are menstruating at age 10 and even 9, which means they are exposed to higher levels of estrogen (which unfortunately can lead to higher rates of cancer).
Cow’s milk, for example, cow’s milk is one of the worst things we consume as humans because of the high levels of estrogen, hormones, chemicals that are not only pumped into the cow but used to process the milk. Does this exposure lead to cancer and what do doctors, USDA, FDA recommend? Multiple servings of milk as a source of calcium. No, I’m not vegan.
There are more of us in my family who got our period at age 9 or 10 versus our parents and older generations who got their first period at age 15 or 17. Not only that, the younger generation migrated to the US from the Caribbean.
At this age or much younger we start eating food with a ton of chemicals compared to here at home. Yes, most, if not all, of us have larger breasts than our mothers and grandmothers. Some have breast reduction and their breasts return to almost the same size, some after breast reduction due to pregnancy and some due to weight fluctuations.