Unfortunately, due to the highly restrictive nature of the diet, vegans are at risk of being deficient in certain nutrients such as calcium and vitamin B12 usually found in dairy and meat respectively.

Plant-based diets require great amounts of quality soil in which to grow those plants. Soils act as a home for greenhouse gases, and when they are constantly being plowed and turned over to plant crops, this churning releases greenhouse gases that would otherwise be trapped in healthy soils.

As you read along, you'll find out that most health conditions developed by vegans are related to vitamin B12 deficiency. Without the familiar sources of vitamin B12, certain bodily functions can be disrupted, leading to anemia, gastritis, stroke, Crohn's disease, and Celiac disease.