Why a Vegan or Plant-Based Diet Can Be Bad for Periods

A vegan or exclusively plant-based diet can make periods lighter and less painful, which is good. Over time, however, a plant-based diet can cause irregular or heavy periods due to impaired ovulation and low progesterone.

Phytoestrogens are a factor but the main problem with an exclusively plant-based diet is that it cannot provide an adequate supply of nutrients such as zinc, iodine, iron, vitamin A, and taurine.