Vegan diet nutrition
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Vegan Diet Nutrition: Macronutrients and Micronutrients
Vegan diets exclude all animal products and by-products, which leads to distinct nutritional profiles compared to omnivorous and other vegetarian diets. Vegans typically consume less protein than those on other diets, but their intake usually remains within recommended levels if the diet is well-planned and includes a variety of plant-based protein sources Bakaloudi2020Neufingerl2021. Fat intake is generally similar to other diets, but vegans consume less saturated fat and cholesterol, and more dietary fiber Bakaloudi2020Craig2009Neufingerl2021.
However, vegan diets are often lower in certain micronutrients. Common nutrients of concern include vitamin B12, vitamin D, calcium, iodine, zinc, selenium, and long-chain omega-3 fatty acids (EPA and DHA) Bakaloudi2020Craig2009Koeder2022+7 MORE. Vitamin B12 intake is especially low among vegans, and without supplementation or fortified foods, deficiency is likely Bakaloudi2020Craig2009Koeder2022+7 MORE. Calcium and iodine intakes are also frequently below recommended levels, and vegans may have lower bone mineral density and iodine status Bakaloudi2020Koeder2022Pandya2025+4 MORE.
On the other hand, vegan diets are not typically associated with deficiencies in vitamins A, B1, B6, C, E, iron, phosphorus, magnesium, copper, and folate, and they tend to have a low glycemic load Bakaloudi2020Craig2009Neufingerl2021. Vegans often have higher intakes of fiber, folate, vitamin C, vitamin E, potassium, magnesium, and phytochemicals Craig2009Łuszczki2023Neufingerl2021.
Health Benefits of a Vegan Diet
A well-planned vegan diet is associated with several health benefits. Vegans tend to have lower body mass index (BMI), lower serum cholesterol, and lower blood pressure, which reduces the risk of heart disease Craig2009Łuszczki2023Marrone2021+2 MORE. Vegan diets are also linked to a reduced risk of chronic diseases such as type 2 diabetes, hypertension, metabolic syndrome, and certain types of cancer Łuszczki2023Marrone2021Koutentakis2023. The high intake of antioxidants and phytonutrients in vegan diets may help reduce inflammation and oxidative stress, potentially offering protective effects against neurodegenerative diseases and supporting immune function Clemente-Suárez2025Koutentakis2023.
Risks and Challenges: Nutrient Deficiencies
Despite the benefits, vegan diets can lead to deficiencies in key nutrients if not carefully planned. The most critical nutrients to monitor are vitamin B12, vitamin D, calcium, iodine, zinc, selenium, iron, and omega-3 fatty acids (EPA/DHA) Bakaloudi2020Craig2009Koeder2022+7 MORE. Deficiencies in these nutrients can have health consequences, such as impaired neurological function, reduced bone health, and increased risk of cognitive decline Koeder2022Pandya2025Jakše2021+3 MORE. The presence of antinutritional factors like phytates and oxalates in plant foods can further reduce the absorption of minerals such as iron and zinc .
Vulnerable groups—including infants, children, pregnant or lactating women, the elderly, and athletes—are at higher risk of deficiencies and require special attention to dietary planning and supplementation Koeder2022Pandya2025Jakše2021.
Recommendations for a Healthy Vegan Diet
A well-designed vegan diet should include a wide variety of plant foods and, when necessary, fortified foods or supplements to ensure adequate intake of vitamin B12, vitamin D (especially in winter), calcium, iodine, zinc, selenium, and omega-3 fatty acids (EPA/DHA) Koeder2022Łuszczki2023Jakše2021+4 MORE. Regular monitoring and guidance from health professionals are important, especially for those in vulnerable groups Koeder2022Pandya2025Jakše2021.
Public health strategies should focus on consumer education, food fortification, and supplementation to help vegans meet their nutritional needs and to facilitate a healthy transition to plant-based diets Koeder2022Jakše2021Neufingerl2021.
Conclusion
A vegan diet can be nutritionally adequate and offer significant health benefits if it is well-planned and includes appropriate supplementation or fortified foods. However, without careful attention to key nutrients, there is a risk of deficiencies that can impact overall health. Education, planning, and regular monitoring are essential for anyone following a vegan diet to ensure optimal nutrition and health outcomes.
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