The vegan diet restricts all animal products for ethical, environmental, or health reasons. It is the strictest form of vegetarianism. In this diet, apart from restricting meat, people even abstain from having dairy products, eggs, and animal-derived products, such as gelatin, honey, albumin, whey, casein, and some forms of vitamin D3. Most people follow this diet for ethical reasons but studies suggest that following this diet may prevent certain diseases like heart disease, cancers, and diabetes. This diet helps to keep your fuller, which prevents you from indulging in unhealthy snacking. The only downside of this diet is that it may be low in several nutrients like vitamin B12, vitamin D, iodine, iron, calcium, zinc, and omega-3 fatty acids.