Removing animal products is the dietary choice that raises the most practical questions: how to cover B12, iron, zinc, iodine, long-chain omega-3? The answer is documented and reassuring for the informed adult: it is possible, provided you know what must be supplemented (non-negotiable) and what the plate covers (combinations, plant sources). Poorly built vegetarianism produces deficiencies; informed vegetarianism is a healthy dietary pattern.
Vegetarian, vegan, plant-based: the differences that matter
The vocabulary is not interchangeable, and the risk of deficiency follows the intensity of exclusion.
- Vegetarian: no meat, fish, seafood; eggs and dairy kept. The safest level: most critical nutrients remain accessible.
- Vegan (dietary): no animal product, including eggs, dairy, honey. B12, calcium, iodine and DHA become critical.
- Vegan (lifestyle): dietary veganism extended to all animal-derived products (leather, cosmetics). Nutritionally identical.
- Flexitarian: reduction without total exclusion; the easiest pattern to secure.
The risk is not in the choice but in improvisation: an informed vegan who supplements is better off than a vegetarian who replaces meat with pasta.
B12: the non-negotiable supplement
Vitamin B12 is the only nutrient absent from every unsupplemented plant food: it is produced by bacteria and concentrated in animal tissues. Neither algae, nor malted yeast, nor ‘plant sources’ of B12 provide it reliably (they contain inactive analogues that distort the assay).
The data: B12 deficiency affects a significant proportion of unsupplemented vegans; the consequences are serious (megaloblastic anaemia, irreversible neuropathy, risk in the infant of a deficient mother).
The rule: systematic supplementation in the vegan, recommended in the vegetarian who eats little dairy or eggs. Cyanocobalamin or methylcobalamin form, weekly or daily dose depending on the protocol, annual B12 assay (and homocysteine if in doubt). There is no ‘good vegan without B12’: supplementation is the founding act.
Iron, zinc, iodine, calcium: the minerals to watch
Plants contain the same minerals but less bioavailable, and strategies exist.
Iron: non-haem plant iron is absorbed less well (2-5 per cent versus 15-25 per cent for haem). The combinations that compensate: vitamin C at the same meal (lemon, pepper, kiwi), soaking and fermenting legumes which reduce phytates, avoiding tea and coffee around the meal. Women of childbearing age have high requirements; ferritin is monitored.
Zinc: less bioavailable from plants (phytates), requirements increased by about 50 per cent in vegans. Sources: legumes, pumpkin seeds, whole grains, nuts.
Iodine: critical in the vegan who does not use iodised salt (dairy is the usual source). Sources: iodised salt, seaweed (beware excessive kombu doses), measured supplementation on a strict diet.
Calcium: removing dairy imposes plant sources: calcium-set tofu, fortified plant milks, green vegetables (broccoli, kale, spinach with the oxalate limit), almonds, tahini. The calcium of broccoli is better absorbed than that of milk; the volume required is the constraint.
DHA/EPA: the plant sources and their limits
Long-chain omega-3 (EPA, DHA) are produced by algae and concentrated by fish. Plants provide ALA (flax, chia, walnuts, rapeseed), which the body converts to EPA/DHA at a low rate (5-10 per cent for EPA, under 5 per cent for DHA).
The vegan strategy: daily ALA (a tablespoon of flax or rapeseed oil, ground flax/chia seeds), and for increased needs (pregnancy, breastfeeding, vision, cognition) a supplement of algal DHA/EPA, the only direct plant source of long-chain omega-3.
The balance: reduce omega-6 (sunflower, maize, seed oils) which compete with ALA conversion; the omega-3/omega-6 ratio is the lever more than ALA quantity alone.
Proteins: de facto complementation, not a magic combination
The old rule ‘combine legume + grain at every meal’ has been relaxed: amino acids complement over the day, not necessarily on the same plate. But de facto complementation remains the principle: rice + lentils, maize + beans, hummus + bread cover all essential amino acids.
The real point of vigilance: quantity and quality. Adult protein needs (~0.8-1 g/kg) are met without difficulty with legumes, soy, seitan, whole grains, nuts. The athletic or elderly vegan aims higher; the vegan who lives on refined starches and unfortified plant milk risks deficit.
| Nutrient | Risk | Strategy |
|---|---|---|
The TCM reading: Blood and plant proteins
Chinese dietetics reads vegetarianism in the language of Blood: animal proteins nourish Blood abundantly (meats, eggs, fish are the ‘Blood nourishers’), and their prolonged exclusion exposes the fragile terrain (menstruating woman, convalescent, athlete) to Blood Deficiency.
The TCM solution is not to renounce but to compensate with what nourishes Blood in the plant world: legumes (adzuki beans, lentils, chickpeas), seeds (black sesame), nourishing fruits (dates, raisins, mulberries), whole grains, dark green vegetables, and seaweed for minerals. Soy (soy and phytoestrogens) is the most complete plant protein and the closest to the animal profile.
What requires medical advice
B12 supplementation is non-negotiable in the vegan; annual testing (B12, ferritin, ± zinc, iodine depending on the diet, D depending on exposure) is an act of safety. Sensitive populations (pregnancy, breastfeeding, childhood, adolescence, intensive sport) need dietetic support; the vegan infant and child must be followed for growth, B12, iron, calcium and vitamin D.
FAQ: vegetarianism and veganism
Can you be vegan and healthy?
Yes, provided B12 systematically, combinations that compensate for minerals, sources of calcium and DHA/EPA, and annual monitoring. Nutrition academies recognise well-built veganism as suitable for all stages of life, with reinforced support for sensitive populations.
Is plant protein sufficient?
Yes in quantity and quality if legumes, soy, whole grains and nuts are daily. De facto complementation over the day covers essential amino acids without rigid combination at every meal.
Can children be vegan?
Possible but demanding: B12, iron, calcium, zinc, iodine, D, protein and energy must be secured, and growth monitored. Support from a trained dietitian is recommended; improvisation exposes to real deficiencies.
Is plant iron enough?
It is enough if absorption strategies are applied (vitamin C, reduced phytates, no tea with meals) and ferritin is monitored, especially in menstruating women. Iron deficiency is the most frequent risk of poorly built vegetarianism.
Informed vegetarianism: a healthy pattern, not an improvisation
Removing animal products is a legitimate and healthy choice for the adult who knows what is required: non-negotiable B12, compensating combinations, plant sources of calcium and omega-3, monitoring. Vegetarianism does not fail because it is vegetarian; it fails when it is improvised.
To go further
Yin Shi ecosystem resources directly related to this article.