According to a 2011 study in Nature, antibiotics disrupt the metabolic hormones leptin and ghrelin. That effect lasts for at least one year and results in significant weight gain. In another 2012 study, researchers found that British children exposed to antibiotics early in life are more likely to become overweight later in life.
Antibiotics promote thyroid disease, menstrual disorders, and estrogen dominance. Even a few courses of antibiotics can increase the risk of breast cancer by 150 percent.
Antibiotics are a life-saving miracle, but they’re also not great for our hormonal system. Why? Because they disrupt our healthy gut bacteria.