What is the most purist form of vegetarianism that prohibits all animal products?

The most purist form of vegetarianism is veganism, which prohibits all animal products, including meat, dairy, eggs, and any other substances derived from animals. This dietary choice is based on ethical, environmental, and health reasons, emphasizing a completely plant-based lifestyle. Veganism extends beyond diet to include other areas such as personal care products and clothing, steering clear from all forms of exploitation or harm to animals.

In contrast, semi-vegetarianism allows for the occasional consumption of meat or other animal products, while lacto-vegetarianism permits dairy products but excludes eggs. Macrobiotic diets are often plant-based but may include fish and other foods depending on individual interpretation. Thus, these options do not align with the principles of veganism, which is distinct in its comprehensive avoidance of all animal-derived items. This clarity makes veganism the most restrictive and purist approach within vegetarianism.