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But adipose cells release all the other molecules they've hoarded, too. That includes key hormones like estrogen, along with fat-soluble vitamins and any organic pollutants that found their way into your bloodstream as you gained weight.
Adipose tissue’s tendency to store things is an unfortunate side-effect, because often we need those things to be circulating, not sitting around. Take hormones, for instance. Female body fat actually produces some of its own estrogen in addition to storing it, and the more adipose tissue a person has, the more estrogen they’re exposed to. This is why being overweight puts you at an increased risk of getting breast cancer. Many types of breast cancer are caused by malfunctions in estrogen receptors, which are more likely to go haywire when more estrogen is around to stimulate them.
