One of the primary reasons people quit veganism is health concerns. While veganism can be a healthy and sustainable diet when done correctly. Some individuals may experience inadequate nutrition and deficiencies due to a lack of knowledge about plant-based sources of essential nutrients.

You Will Become Protein Deficient Vegan sources of protein — like beans, nuts, seeds, plant-based meat products, tofu, chickpeas, lentils, and a wide variety of legumes — are hard to come by. If you are an athlete, it is also tricky to be a success in your field without eating meat for protein.

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.

Their reasons for eating this way vary. Some vegans do it to improve their health, as research shows that a plant-based diet could lower the risk of certain diseases. Others stay away from meat because they don't want to harm animals or because they want to protect the environment.