Vitamin B12 is found only in animal products, so its deficiency is best supplemented in the form of a supplement. Sun exposure is an excellent source of vitamin D, but supplementation is also necessary in the period from September to April. To avoid calcium and iron deficiencies, a vegan diet should include soy milk, green leafy vegetables and legumes. You can find iron in legumes and whole grain products. Avocados, seeds and seeds are also rich in iron. In turn, to provide nutrients containing protein, we should reach for ingredients such as: soybeans, lentils, peas, beans, nuts or high-quality grain products, and we should not forget about chickpeas.