Beer and Wine Isinglass, a gelatin-based substance derived from fish, is used as a clarifying agent in some beer and wine. Other non-vegan ingredients sometimes used are casein (from milk) and egg whites.

Level 4 vegans are incredibly committed to veganism, and follow a strict dietary regime. A level 4 vegan's diet is likely to contain more fruits, vegetables and nuts. Level 4 vegans will often only eat out at vegan restaurants, or if that is not an available option they will only choose a vegan option.

Research has shown that a vegan diet can help do the following: Promote weight loss. Reduce your risk of heart disease by lowering cholesterol levels. Lower your chances of getting certain types of cancer, such as colon cancer.

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.