A vegan diet eliminates all animal-derived foods, including meat, fish, dairy, eggs, and honey. Unlike vegetarian diets, which typically allow dairy and eggs, a vegan diet draws entirely from plants: fruits, vegetables, grains, legumes, nuts, and seeds. People adopt it for a mix of health, environmental, and ethical reasons, and when well-planned, it can meet all nutritional needs at any stage of life.
What Vegans Actually Avoid
The obvious exclusions are straightforward: no beef, chicken, pork, fish, shellfish, milk, cheese, butter, yogurt, or eggs. But a vegan diet also cuts out less obvious animal-derived ingredients that show up in everyday products. Honey and other bee products like royal jelly are off the table. Gelatin, made from the skin, bones, and connective tissue of cows and pigs, appears in Jell-O, marshmallows, gummy bears, and some chewing gums. Carmine, a red dye made from ground cochineal insects, colors certain candies, juices, and cosmetics.
Some surprises catch new vegans off guard. Many beers and wines are filtered using egg whites, gelatin, or isinglass (a substance from fish bladders). Worcestershire sauce typically contains anchovies. Some breads and bagels use L-cysteine, an amino acid often sourced from poultry feathers, as a dough softener. Certain french fries are cooked in animal fat. Even deep-fried vegetables can contain eggs in the batter. Reading ingredient labels becomes second nature for most vegans, particularly when it comes to processed and restaurant foods.
Health Benefits With Real Numbers
The cardiovascular benefits of a vegan diet are well-documented. Compared to omnivores, people following a vegetarian or vegan diet see average drops of 7% in total cholesterol and 10% in LDL (“bad”) cholesterol. They also experience a 14% reduction in apolipoprotein B, a protein particle that carries cholesterol into artery walls. These aren’t dramatic swings, but sustained over years, they meaningfully lower heart disease risk.
Plant-based eating also appears protective against type 2 diabetes, though the quality of plant foods matters. An overall plant-based diet pattern is associated with an 11% lower risk of developing diabetes. When researchers looked specifically at diets rich in whole grains, fruits, vegetables, nuts, and legumes (rather than refined grains and sugary foods), the risk dropped by 15%. A vegan diet built around processed snacks and white bread doesn’t carry the same benefit as one centered on whole foods.
Nutritional Gaps to Plan For
Vitamin B12
B12 is the single most important nutrient for vegans to actively manage. It’s produced by bacteria and concentrated in animal tissues, so plant foods contain almost none of it naturally. Studies of vegan populations in Western Europe and the U.S. show deficiency rates ranging from 5% to 52%, depending on the population studied and how deficiency is measured. One UK study found that 52% of male vegans had deficient B12 levels. In the U.S., the rate was closer to 8%, likely reflecting higher rates of supplementation and B12-fortified foods. Regular supplementation dramatically reduces these numbers, making it non-negotiable for anyone eating a fully vegan diet. B12 deficiency develops slowly but can cause nerve damage, fatigue, and cognitive problems if left unchecked.
Omega-3 Fatty Acids
Your body needs two long-chain omega-3 fats, EPA and DHA, for brain function, eye health, and controlling inflammation. Fish is the primary dietary source. Vegans rely on ALA, a shorter-chain omega-3 found in flaxseeds, chia seeds, and walnuts, which the body converts into EPA and DHA. The problem is that conversion is inefficient. In men, roughly 8% of ALA converts to EPA and somewhere between 0% and 4% converts to DHA. Women do better, converting about 21% to EPA and 9% to DHA, likely due to the influence of estrogen. Algae-based omega-3 supplements provide EPA and DHA directly and are the most reliable vegan source.
Calcium and Bone Health
Bone health deserves attention on a vegan diet. Systematic reviews have found that vegans tend to have lower bone mineral density and a higher risk of fractures compared to omnivores. This doesn’t mean a vegan diet inevitably weakens bones, but it does mean calcium intake requires deliberate planning. Fortified plant milks, tofu made with calcium sulfate, kale, bok choy, and fortified orange juice are all solid sources. Vitamin D, which helps the body absorb calcium, is another common gap since few plant foods contain it naturally.
Protein and Amino Acids
Getting enough total protein on a vegan diet is rarely a problem if you’re eating enough calories from varied whole foods. The real consideration is leucine, an amino acid that triggers muscle protein synthesis. Animal proteins are rich in leucine, but plant sources hold up well when you eat enough of them. A half cup of firm tofu provides about 1.75 grams of leucine, comparable to a cup of dried whey. Combining protein sources throughout the day (legumes, soy products, whole grains, seeds) ensures a complete amino acid profile without needing to obsess over individual meals.
Environmental Impact
For many people, environmental concerns are a primary motivator. According to data cited by the United Nations, switching to a vegan diet can reduce an individual’s annual carbon footprint by up to 2.1 tons of CO2 equivalent. For context, that’s roughly the emissions from driving 5,000 miles in an average car. A vegetarian diet saves about 1.5 tons. These savings come from reduced land use, lower water consumption, and fewer methane emissions from livestock. Animal agriculture is one of the largest contributors to deforestation, water pollution, and biodiversity loss globally, so dietary shifts at scale have meaningful environmental consequences.
What a Typical Day Looks Like
A well-planned vegan day might include oatmeal with berries, ground flaxseed, and fortified plant milk for breakfast. Lunch could be a grain bowl with roasted vegetables, chickpeas, tahini, and leafy greens. Dinner might feature a stir-fry with tofu, brown rice, and broccoli, or a lentil-based soup with whole grain bread. Snacks like nuts, hummus with vegetables, or fruit with nut butter fill in calorie and nutrient gaps.
The key supplements most vegans take are B12 (essential), vitamin D (especially in northern climates), and an algae-based omega-3 (strongly recommended). Some also supplement iron, iodine, or zinc depending on their individual diet and blood work results. A vegan diet isn’t inherently deficient in these nutrients, but because the margin for error is smaller than with an omnivorous diet, a little planning goes a long way.
Healthy Vegan vs. Unhealthy Vegan
Not all vegan diets are equal. French fries, Oreos, white pasta, and sugary cereals are technically vegan. A diet built around these foods can be low in fiber, vitamins, and minerals while being high in refined carbohydrates and sodium. The diabetes research makes this distinction clearly: only diets emphasizing whole plant foods showed meaningful risk reduction. Processed vegan meat alternatives can be convenient for transitioning, but many are high in sodium and contain long ingredient lists. Treating them as occasional convenience foods rather than dietary staples is a reasonable approach.
The healthiest versions of a vegan diet share common features: a wide variety of vegetables and fruits, consistent legume intake for protein and iron, whole grains over refined ones, nuts and seeds for healthy fats, and reliable supplementation for the nutrients plants can’t easily provide.