14. Irregular menstrual cycle
Millions of women all over the world suffer from irregular menstrual cycles, many of them fight against infertility due to an illness called polycystic ovary syndrome (PCOS). Besides obesity insulin resistance or diabetes is the key reason for it. Low-protein and high-carb diets contribute both to insulin resistance and weight gain that disturbs the fragile balance of the female hormone system, and together with that the regular cycle.