Veganism is a form of vegetarianism that excludes all animal products such as meat, fish, eggs, dairy and honey. People choose a vegan lifestyle for ethical reasons related to animal welfare, environmental concerns, and health benefits. A balanced vegan diet focuses on fruits, vegetables, whole grains, legumes, nuts and seeds to provide sufficient nutrients. However, vegans must supplement with vitamin B12 and consider iodine and vitamin D intake depending on their individual needs and diet.