Vegan diet health effects
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Vegan Diet Health Benefits: Cardiometabolic, Weight, and Chronic Disease Risk
A vegan diet, which excludes all animal products, is linked to several health benefits. Research consistently shows that vegans tend to have lower body weight, lower body mass index (BMI), and reduced serum cholesterol and blood pressure, which together lower the risk of heart disease and obesity Craig2009Wangmo2023Termannsen2022+5 MORE. Studies also report that vegan diets can improve glycemic control, reduce the risk of type 2 diabetes, and may help prevent metabolic syndrome Wangmo2023Termannsen2022Selinger2022+3 MORE. There is evidence that vegans have a lower risk of certain cancers and possibly lower all-cause mortality, although the certainty of this evidence is moderate to low Selinger2022Łuszczki2023Le2014.
Vegan Diet and Cardiovascular Health
Vegan diets are associated with favorable changes in cardiovascular risk markers, including lower total cholesterol, LDL cholesterol, and reduced inflammation Termannsen2022Selinger2022Koutentakis2023+1 MORE. The high intake of fiber, phytonutrients, and antioxidants from plant foods supports immune function and may further protect against cardiovascular disease Craig2009Koutentakis2023Łuszczki2023. However, vegans may have lower levels of certain nutrients important for heart health, such as omega-3 fatty acids (EPA and DHA), vitamin B12, and selenium, which could have negative effects if not addressed Craig2009Koutentakis2023Clemente-Suárez2025.
Nutritional Deficiencies and Risks of a Vegan Diet
While a vegan diet can be rich in fiber, vitamins C and E, folate, magnesium, and potassium, it can also lead to deficiencies in key nutrients. The most common concerns are for vitamin B12, vitamin D, calcium, iron, zinc, iodine, and long-chain omega-3 fatty acids Craig2009Koutentakis2023Marrone2021+2 MORE. These deficiencies can impact bone health, neurological function, and overall well-being if not managed with fortified foods or supplements Craig2009Selinger2022Koutentakis2023+3 MORE. For example, studies show a higher risk of fractures and lower bone mineral content among vegans, likely due to lower calcium and vitamin D intake Selinger2022Koller2023. Deficiencies in vitamin B12, DHA, EPA, and iron are also linked to cognitive decline and mood disturbances .
Vegan Diet in Children and Adolescents
For children and adolescents, vegan diets can provide higher intakes of fiber, vitamins, and minerals, but also result in lower protein, calcium, vitamin B2, and ferritin levels compared to omnivorous diets . There are concerns about lower height, bone mineral content, and potential iodine deficiency in vegan children, highlighting the need for careful dietary planning and supplementation .
Implementation and Dietary Planning
A well-planned vegan diet that includes adequate calories, nutrients, and necessary supplements (especially vitamin B12, vitamin D, and omega-3s) can support good health and reduce the risk of chronic diseases Craig2009Marrone2021Clemente-Suárez2025+1 MORE. However, without proper planning, there is a risk of nutritional deficiencies that can have serious health consequences Craig2009Selinger2022Koutentakis2023+4 MORE.
Conclusion
A vegan diet offers significant health benefits, particularly for weight management, heart health, and reducing the risk of chronic diseases. However, it also carries risks of nutritional deficiencies, especially if not carefully planned. Supplementation and attention to nutrient intake are essential for anyone following a vegan diet, especially children, adolescents, and those with higher nutritional needs. More research is needed to fully understand the long-term health effects and to optimize dietary strategies for vegans Selinger2022Clemente-Suárez2025Koller2023+1 MORE.
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