What Is a Vegan Diet? Benefits, Risks & How to Start

What Veganism Actually Means

A vegan diet excludes all animal-derived products: meat, poultry, fish, dairy, eggs, and typically honey. Many vegans extend this philosophy beyond food into clothing (no leather or wool), cosmetics (no animal testing), and other lifestyle choices. Dietary veganism is the food-focused version and is what this article covers.

A vegan diet is naturally rich in fiber, antioxidants, folate, vitamin C, magnesium, potassium, and phytochemicals. Done well, it's one of the most evidence-backed eating patterns for long-term health. Done poorly — living on white pasta, chips, and fake meats — it can be as unhealthy as any other junk-food diet.

What to Eat on a Vegan Diet

Legumes: beans, lentils, chickpeas, edamame, peas — your main protein sources
Whole grains: oats, brown rice, quinoa, farro, whole wheat bread and pasta
Soy foods: tofu, tempeh, soy milk, edamame — the highest-quality plant proteins
Nuts and seeds: almonds, walnuts, chia, flax, hemp, pumpkin seeds
Vegetables: leafy greens, cruciferous veg, root vegetables — as much variety as possible
Fruits: berries, citrus, bananas, apples, and everything in between
Plant oils: olive oil, avocado oil
Fortified foods: plant milks and nutritional yeast fortified with B12

The Protein Question

The most common worry about vegan diets is protein. The reality: it's easy to hit your protein target on a well-planned vegan diet, but it does require intention. Most omnivores get protein by default from meat, dairy, and eggs. Vegans need to actively include protein-rich foods at most meals.

The best plant protein sources are soy foods (tofu, tempeh, edamame, soy milk), lentils, chickpeas, beans, seitan (if you tolerate gluten), and high-quality plant protein powders like pea or soy. Whole grains and vegetables also contribute meaningful amounts. A 150-pound active adult can easily hit 100-130g of protein per day on a plant-based diet by eating 3-4 protein-rich sources.

Nutrients to Watch

Vitamin B12 (Non-Negotiable)

B12 is made by bacteria, not plants. No reliable plant source exists. Every vegan must supplement B12 or eat fortified foods regularly — typically 25-100mcg per day or 1000-2500mcg twice per week. Deficiency causes irreversible nerve damage and is not something to be casual about.

Omega-3 (EPA and DHA)

Plants contain ALA (flax, chia, walnuts), but the conversion to the active forms EPA and DHA is inefficient (typically under 10%). An algae-based omega-3 supplement is the cleanest way to cover this.

Iron, Zinc, Calcium, Iodine, Vitamin D

Plant iron (non-heme) is less bioavailable than animal iron. Pair iron-rich foods with vitamin C to boost absorption. Calcium is easy with fortified plant milks and leafy greens. Iodine usually requires iodized salt or a supplement. Zinc comes from legumes, seeds, and whole grains. Vitamin D levels should be tested and supplemented as needed — this applies to omnivores too.

Health Benefits Supported by Research

Lower risk of cardiovascular disease: vegans have significantly lower LDL cholesterol and blood pressure on average
Lower risk of type 2 diabetes: high fiber and plant protein improve insulin sensitivity
Lower body weight: plant-based diets are naturally lower in calorie density
Reduced cancer risk: particularly colorectal cancer, in large observational studies
Improved gut health: high fiber intake supports a diverse microbiome

The Sustainability Angle

For many people, going vegan is as much about ethics and environment as it is about health. Animal agriculture contributes roughly 14-18% of global greenhouse gas emissions, uses enormous amounts of land and water, and is the single largest driver of biodiversity loss according to multiple reviews. A plant-based diet typically reduces an individual's dietary carbon footprint by 40-75%.

If full veganism feels extreme, research shows that even reducing meat by 50% — often called a flexitarian approach — captures most of the environmental benefit.

How to Start

Replace, don't just remove: swap chicken for tofu or lentils, milk for soy milk, cheese for avocado or hummus. Don't just eat a plate of plain vegetables and wonder why you're hungry.
Use our calorie calculator to set your daily target, and aim for at least 1.2g of protein per kg of body weight during the transition.
Start a B12 supplement from day one. Non-negotiable.
Batch cook staples: a pot of lentils, roasted veggies, and cooked grains at the start of the week makes weekday meals trivial.
Learn 5-6 meals you actually enjoy before worrying about variety. A short list of great meals beats a long list of mediocre ones.

The Bottom Line

A well-planned vegan diet is one of the healthiest and most environmentally sustainable ways to eat. 'Well-planned' is the important phrase — you need to take protein, B12, omega-3, and micronutrients seriously, not assume they'll just work out.

If you're curious how veganism stacks up against keto, vegetarian, carnivore, and paleo diets, check our side-by-side comparison to see which fits your goals and lifestyle best.