The Benefits and Harms of Following A Vegan Diet

by | Jul 23, 2025 | Health, Nutrition | 0 comments

In recent years, the vegan diet has gained immense popularity. It is growing not only because of ethical and environmental reasons but also for its purported health benefits. By eliminating all animal products, veganism can drastically reshape one’s nutritional intake, often leading to powerful positive outcomes. However, going fully plant-based also comes with potential nutritional deficiencies that must be managed with intention. In this blog post, we’ll explore both the benefits and potential harms of following a vegan diet to help you make more well informed dietary choices.

Benefits of a Vegan Diet

1. Improved Heart Health

Vegan diets are typically high in fiber, antioxidants, and healthy plant compounds. They’re also lower in saturated fats and cholesterol. These characteristics have been linked to:

  • Lower LDL (“bad”) cholesterol
  • Reduced blood pressure
  • Decreased risk of heart disease and stroke

2. Lower Risk of Chronic Diseases

Numerous studies have shown that vegans tend to have a lower risk of:

  • Type 2 diabetes
  • Certain cancers (especially colorectal and breast)
  • Obesity and metabolic syndrome

This is largely due to the abundance of whole foods such as fruits, vegetables, legumes, and whole grains in vegan diets.

3. Better Weight Management

Vegan diets are naturally lower in calories and high in satiety-promoting foods, which can make weight control easier. Many people report easier fat loss and increased energy levels after transitioning to a plant-based lifestyle.

4. Environmental and Ethical Advantages

A vegan diet generally has a smaller carbon footprint, uses fewer natural resources, and avoids the ethical concerns tied to factory farming and bioengineered animals.

Harms and Risks of a Vegan Diet

While the benefits are promising, a poorly planned vegan diet can lead to several nutrient deficiencies, especially over the long term.

1. Vitamin B12 Deficiency

Vitamin B12 is essential for red blood cell formation and neurological health. Since it is only naturally found in animal products, vegans must obtain it from:

  • Fortified foods (e.g., plant milks, cereals)
  • Supplements

Deficiency symptoms: Fatigue, nerve damage, memory issues

2. Iron Deficiency

Plant-based iron (non-heme iron) is less bioavailable than animal-based heme iron. This can lead to iron-deficiency anemia, especially in women of reproductive age.

Tip: Pair iron-rich plant foods (like lentils and spinach) with vitamin C sources to boost absorption.

3. Protein Gaps

While it’s possible to get enough protein on a vegan diet, it requires more planning. Vegans need to combine a variety of plant proteins to ensure all essential amino acids are covered.

Good sources: Nuts, lentils, tofu, tempeh, quinoa, pumpkin seeds, sunflower seeds, chickpeas, and hemp seeds.

4. Calcium and Vitamin D Deficiency

Without any dairy consumption the calcium and vitamin D intake can plummet. This can affect bone density and increase the risk of bone fractures.

Alternatives: Fortified plant milks, leafy greens, and mineral supplements when necessary.

5. Omega-3 Fatty Acids

EPA and DHA — key omega-3s important for brain and heart health — are found mainly in fish. Vegans must rely on:

  • Flaxseeds
  • Chia seeds
  • Walnuts
  • Algae-based supplements (for DHA/EPA)

Final Thoughts: A Balanced Approach

A vegan diet, when well-planned, can be incredibly health-promoting, disease-preventing, and environmentally sustainable. However, it is not automatically “healthy” by default. Oreos, soda, and French fries are technically vegan but they are empty calories which don’t provide any good quality nutritional value.

For those choosing a vegan lifestyle, it’s essential to:

  • Eat a wide variety of whole plant foods
  • Monitor for nutrient deficiencies
  • Consider routine blood work and dietary supplements

Whether for health, environmental, or ethical reasons. Veganism can be a powerful lifestyle choice. When done mindfully and backed by sound nutritional principles it can provide a healthy lifestyle and supplement the mind and body.

References:

1. Alcorta A, Porta A, Tárrega A, Alvarez MD, Vaquero MP. Foods for Plant-Based Diets: Challenges and Innovations. Foods. 2021 Feb 1;10(2):293. doi: 10.3390/foods10020293. PMID: 33535684; PMCID: PMC7912826.

2. Bakaloudi DR, Halloran A, Rippin HL, Oikonomidou AC, Dardavesis TI, Williams J, Wickramasinghe K, Breda J, Chourdakis M. Intake and adequacy of the vegan diet. A systematic review of the evidence. Clin Nutr. 2021 May;40(5):3503-3521. doi: 10.1016/j.clnu.2020.11.035. Epub 2020 Dec 7. PMID: 33341313.3. 

3. Bali A, Naik R. The Impact of a Vegan Diet on Many Aspects of Health: The Overlooked Side of Veganism. Cureus. 2023 Feb 18;15(2):e35148. doi: 10.7759/cureus.35148. Erratum in: Cureus. 2025 Apr 10;17(4):c216. doi: 10.7759/cureus.c216. PMID: 36950003; PMCID: PMC10027313.

4. Clem J, Barthel B. A Look at Plant-Based Diets. Mo Med. 2021 May-Jun;118(3):233-238. PMID: 34149083; PMCID: PMC8210981.

5. Key TJ, Papier K, Tong TYN. Plant-based diets and long-term health: findings from the EPIC-Oxford study. Proc Nutr Soc. 2022 May;81(2):190-198. doi: 10.1017/S0029665121003748. Epub 2021 Oct 27. PMID: 35934687; PMCID: PMC7613518.

6. Łuszczki E, Boakye F, Zielińska M, Dereń K, Bartosiewicz A, Oleksy Ł, Stolarczyk A. Vegan diet: nutritional components, implementation, and effects on adults’ health. Front Nutr. 2023 Nov 9;10:1294497. doi: 10.3389/fnut.2023.1294497. Erratum in: Front Nutr. 2024 Jan 05;10:1354336. doi: 10.3389/fnut.2023.1354336. PMID: 38024367; PMCID: PMC10665534.

7. Wang T, Masedunskas A, Willett WC, Fontana L. Vegetarian and vegan diets: benefits and drawbacks. Eur Heart J. 2023 Sep 21;44(36):3423-3439. doi: 10.1093/eurheartj/ehad436. PMID: 37450568; PMCID: PMC10516628.