Cons of a Plant-Based Diet Potential Nutrient Deficiencies: Vegetarian and vegan diets need to pay extra attention to ensure they're getting enough protein, calcium, iron, and vitamin B12 in their diets.

Many people still believe that a vegan diet is deficient in essential nutrients, or that it is not sustainable for long-term health. Additionally, vegans may face negative stereotypes, such as being viewed as “preachy” or “judgmental.”

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.