Possible nutritional deficiencies in a vegan diet often include vitamin B12, iron, calcium, and omega-3 fatty acids. Vitamin B12, primarily found in animal products, is crucial for nerve function and blood formation, requiring careful supplementation for vegans. Iron from plant sources is less bioavailable, so it’s important to consume fortified foods or combine iron sources with vitamin C to enhance absorption. Adequate calcium intake is vital for bone health and may require fortified plant milks or supplements. Including sources of omega-3 fatty acids, such as flaxseeds or chia seeds, can also address this deficiency.