A vegan diet is based on plants (such as vegetables, grains, nuts and fruits) and foods made from plants. Vegans do not eat foods that come from animals, including dairy products and eggs.

You'll restrict grains and foods made with them, such as bread and pasta. You also limit starchy vegetables like potatoes and corn, as well as beans and legumes. And you'll cut high-sugar tropical fruits such as pineapple, mango, and bananas, as well as fruit juices and sweets.

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.

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.