A common nutrient deficiency that can result from a vegan diet is vitamin B12 deficiency. This vitamin is primarily found in animal products and is crucial for maintaining healthy nerve function and the production of red blood cells. Vegans must seek fortified foods or consider supplementation to ensure adequate intake of B12. Alongside B12, other nutrients of concern may include iron, omega-3 fatty acids, and protein. Careful planning of a vegan diet is essential to meet nutritional needs and avoid potential deficiencies.