The Rise of the Vegan Diet

Understanding Veganism

The vegan diet has gained traction due to environmental, ethical, and health motivations. Defined as a dietary regimen that includes fruits, vegetables, nuts, seeds, and grains, it excludes all animal products such as meat, fish, dairy, and eggs. In contrast, a vegetarian diet allows for dairy, eggs, and sometimes fish. An insightful overview of the health implications of a vegan diet is provided by Winston J. Craig in his article, “Health Effects of Vegan Diets.”

Health Benefits of a Vegan Diet

Reduced Risk of Cardiovascular Disease

Adopting a vegan diet may significantly lower the risk of cardiovascular disease. Research indicates that vegans generally have a lower body weight, reduced BMI, fewer blood lipids, and lower blood pressure and LDL cholesterol levels compared to vegetarians. Increased consumption of fruits and vegetables enhances the intake of antioxidants, fiber, folic acid, and phytochemicals, which contribute to lower blood cholesterol levels and reduced chances of stroke and heart disease.

Impact on Cancer Risk

The vegan diet may also help in decreasing cancer risk. Obesity is a known risk factor for cancer, and since vegans typically maintain a healthier weight, their risk of developing cancer is potentially lower. Nutrient-rich foods such as fruits, vegetables, and legumes contain protective elements that can fend off various cancers. Antioxidants and anti-proliferative phytochemicals play a crucial role in reducing the growth of cancer cells. However, it is important to note that vegans may face vitamin D deficiencies, which could elevate cancer risks. Further research is necessary to comprehensively understand the relationship between a vegan diet and cancer risk reduction.

Bone Mineral Density Considerations

A potential drawback of the vegan diet is its association with lower bone mineral density. Previous studies have reported instances of hip and spine fractures or bone loss among older vegans, often linked to insufficient protein and calcium intake. Essential nutrients for bone health include magnesium, potassium, vitamin D, and vitamin K. Nonetheless, by consuming a balanced diet rich in fruits and vegetables, vegans can obtain these nutrients. Maintaining an appropriate pH balance is vital for bone health, as acidic foods can lead to increased urinary calcium excretion. A vegan diet that emphasizes alkaline foods—such as leafy greens, tofu, tahini, and fruit juices—can support healthy calcium levels and robust bones. Additionally, soy products are beneficial for both protein intake and bone health.

Nutritional Concerns for Vegans

Certain nutritional deficiencies may arise in a vegan diet, particularly regarding n-3 polyunsaturated fats, vitamin D, vitamin B-12, and zinc.

n-3 Polyunsaturated Fat

Vegans can address their need for long-chain n-3 fatty acids by taking algae-based supplements or consuming ALA-rich foods like flaxseed, hempseed, soy products, and walnuts.

Vitamin D

To ensure adequate vitamin D levels, vegans can opt for supplements, consume fortified foods, and spend time outdoors in sunlight. Vitamin D-rich foods include breakfast cereals, rice milk, soymilk, and orange juice.

Vitamin B-12

Sources of vitamin B-12 for vegans include fortified breakfast cereals, rice milk, soymilk, and nutritional yeast. B-12 supplements are also readily available.

Zinc

Vegans can obtain zinc from legumes, soy products, and whole grains. If not carefully planned, a vegan diet may lack sufficient amounts of B-12, calcium, cholesterol, saturated fat, omega-3 fatty acids, vitamin D, and zinc. Conversely, it tends to be high in dietary fiber, folic acid, iron, magnesium, phytochemicals, vitamin C, and vitamin E, given the increased intake of fruits and vegetables. This abundance can help reduce the consumption of foods linked to chronic diseases.

Conclusion

Further research is essential to fully understand the health effects of a vegan diet and its role in mitigating the risks of heart disease, cancer, and other chronic conditions.

Author Information

Written by Laura Laroche, HBASc, Medical Writer.

References

Health Effects of Vegan Diets. 2019, https://academic.oup.com/ajcn/article/89/5/1627S/4596952?searchresult=1, assessed 15 Aug. 2019.
Image by Jill Wellington from Pixabay.