Vegan Diet: What It Excludes, the Nutrients to Plan and an Indian Vegan Day

A vegan diet contains no food of animal origin. Meat, fish and eggs go, as they do for many Indian vegetarians, and so do milk, curd, paneer, ghee, butter and honey. What remains is cereals and millets, pulses, vegetables, fruit, nuts, seeds and oils, which can cover almost everything an adult needs. The exception is vitamin B12: ICMR-NIN sets the adult allowance at 2.2 mcg a day, and unfortified plant foods are not a reliable supply. This entry is part of NNWA's handbook of diets.

What does a vegan diet exclude?

Everything that comes from an animal. The Academy of Nutrition and Dietetics, in its 2025 position paper, defines vegetarian patterns as those without meat, poultry and seafood, and vegan patterns as those without any food of animal origin. For an Indian household the practical difference is dairy. A lacto-vegetarian thali already has no meat or egg; the vegan version also drops the glass of milk, the katori of curd, the paneer sabzi, the ghee on the roti and the chai made with milk.

Vegan is not the same as healthy. Sugar, maida, vanaspati, namkeen and most fried snacks contain nothing from an animal. The position paper's wording is that appropriately planned vegan patterns can be nutritionally adequate, and the planning is the part that matters.

Which nutrients does an Indian vegan have to plan for?

Five: vitamin B12, calcium, iron, omega-3 fats and protein quality. A 2021 systematic review of 141 studies found that vegans had the lowest vitamin B12, calcium and iodine intakes of any diet group, and lower bone mineral density, while their fibre, folate, vitamin C and magnesium intakes were higher than those of meat eaters. Protein intake was lower on plant-based diets but well within recommended levels. The list is short, and each item has a kitchen answer except B12.

Vitamin B12 comes first because food cannot fix it. A 2023 paper by a group of B12 researchers states that the vitamin is not made by plants, so unfortified plant foods are not a reliable supply. ICMR-NIN's Dietary Guidelines for Indians already call B12 a challenge for vegetarians who take milk, and note that milk holds only a small amount. Remove the milk and nothing is left. The handbook entry on vitamin B12 explains the tests and the forms sold in India; the dose is for your doctor to set.

Calcium is the second gap. On ICMR-NIN's model plate, 300 ml of milk or curd is the main calcium food, and at the 118 mg per 100 g that the Indian Food Composition Tables give for cow's milk it supplies about 354 mg. The vegan replacements are ragi (finger millet) at 364 mg per 100 g, black til at 1,664 mg and green amaranth leaves at 330 mg. The calcium entry and the calcium table for Indian foods list more.

Iron from plants is plentiful on paper and harder to absorb. The Dietary Guidelines advise fermented and sprouted grains and vitamin C foods such as guava to improve absorption, and say tea and coffee should be kept at least one hour away from meals because their tannin interferes with it. The iron entry has the detail. Women, whose allowance is 29 mg a day, have the least margin.

Can plants give you enough protein?

Yes in quantity, with care over quality. The Dietary Guidelines state that vegans eating varied diets of vegetables, beans, grains, nuts and seeds have no difficulty getting enough protein, and that combining cereals with pulses in a 3 to 1 ratio by raw weight is the most efficient way to obtain all nine essential amino acids. Cereals are short of lysine and pulses supply it, as the lysine entry shows. Because plant protein is digested less completely, ICMR-NIN's 2020 note raises the requirement for people on cereal-based diets with low quality protein from 0.83 g to 1 g per kg a day. The protein calculator works out your own figure.

Omega-3 without fish, eggs or dairy

ICMR-NIN's 2020 note sets 2.2 g of omega-3 fat a day. Plants supply it as alpha-linolenic acid: the food tables give flaxseed about 13 g per 100 g, walnuts 8.7 g and mustard oil 11.6 g, so two teaspoons of ground flaxseed cover more than half the day. The Dietary Guidelines add a caution: only a small amount of this plant omega-3 is converted to the long chain forms, EPA and DHA, found in fish. The entry on omega-3 fatty acids covers what that means in pregnancy.

An Indian vegan day, set against ICMR-NIN values

The day below is an illustration, not a prescription. It follows the food group weights of ICMR-NIN's vegetarian plate for about 2,000 kcal, with the milk replaced by more pulses, ragi and seeds. Weights are for raw ingredients, and a teaspoon is 5 g, as in the guidelines' own measures. The katori and phulka counts are this page's approximations of the cooked food. For more ideas, see the vegan recipe collection.

Totalled from the Indian Food Composition Tables, the raw ingredients give about 1,950 kcal, 71 g of protein, 1,090 mg of calcium, 24 mg of iron, 13 mg of zinc and 5.4 g of alpha-linolenic acid. Cereals and pulses stand at 260 g to 110 g, better than the 3 to 1 ratio. Calcium passes the 1,000 mg allowance without milk. Iron clears the average requirement for men and women but stays below a woman's 29 mg allowance. Vitamin B12 is nil. These are amounts in the food, not amounts absorbed.

What do the trials and cohort studies show?

Good evidence for risk factors over months, weaker and mixed evidence for disease over decades. A 2023 meta-analysis in the European Heart Journal pooled 30 randomised trials: against an omnivorous diet, vegetarian and vegan diets lowered total cholesterol by 0.34 mmol/L and LDL cholesterol by 0.30 mmol/L, with no significant change in triglycerides. A 2022 meta-analysis of 11 trials with 796 participants who were overweight or had type 2 diabetes found that vegan diets followed for at least 12 weeks reduced body weight by 4.1 kg and HbA1c by 0.18 percentage points against control diets, with no effect on blood pressure.

Those authors add that some of the effect may come from lower energy intake on the vegan arm, not from the absence of animal food as such. Longer-term findings come from cohort studies, which cannot prove cause. A 2017 meta-analysis of observational studies found a lower incidence of total cancer among vegans, with a relative risk of 0.85 from a limited number of studies, and no difference in all-cause mortality for vegetarians as a whole. Almost none of this research was done in India, on Indian vegan food.

The same kind of study shows a cost. In the EPIC-Oxford cohort, which followed about 55,000 adults for an average of 17.6 years, the 1,982 vegans had 2.31 times the hip fracture risk of meat eaters, equal to about 15 more cases per 1,000 people over ten years, and 1.43 times the risk of any fracture. The gap narrowed but did not vanish after allowing for body mass index, calcium and protein.

A worked example: replacing the milk

This is an illustrative case, not a real person. Take a 29-year-old product designer in Bengaluru, 55 kg, vegetarian since childhood, who decides to stop dairy. Until now she has had about 300 ml of milk and curd a day. The steps below show the arithmetic she can do before changing anything else.

Why is vitamin B12 the Indian problem within the problem?

Because deficiency is already common here among people who do eat dairy. The Comprehensive National Nutrition Survey figures quoted in the Dietary Guidelines for Indians put vitamin B12 deficiency at 13.8 per cent of children aged 1 to 4, 17.2 per cent at 5 to 9 and 30.9 per cent of adolescents aged 10 to 19. NFHS-5 found that 57 per cent of women aged 15 to 49 were anaemic. A vegan diet started without a B12 source adds to a risk the population already carries.

A review of 18 studies in Nutrition Reviews found higher rates of B12 deficiency among vegans than among vegetarians, and among people vegetarian since birth than among those who changed later. Its authors concluded that vegetarians of every type should take preventive measures, including regular use of supplements containing B12. NNWA's article on vitamin B12 for vegetarians covers the signs and the testing.

Common myths and mistakes

The opposite mistake is to assume protein is the main risk. The evidence reviewed above points elsewhere: intake on plant-based diets sits within recommended levels, and a day built on dal, rajma, soya bean and groundnuts passes even the higher 1 g per kg target. B12, calcium and iron deserve the attention that protein usually gets.

Who should see a doctor first, and who is a vegan diet not for?

The 2025 position paper covers adults who are not pregnant or breastfeeding, and says so; it does not extend its conclusion to pregnancy, infancy or childhood. ICMR-NIN asks for special attention to iron, folic acid, B12, iodine and long chain omega-3 in pregnancy, which are the very nutrients a vegan diet makes harder. Pregnant and breastfeeding women, infants, children and adolescents should therefore not be put on a vegan diet without a doctor and a qualified dietitian supervising.

The same applies if you have anaemia, low bone density or a past fracture, an eating disorder, kidney disease, or are older and already eating little. See a doctor promptly for tingling or numbness in the hands or feet, unusual tiredness, breathlessness, a sore tongue or memory changes, which can accompany B12 deficiency or anaemia. Do not stop or change a prescribed medicine because your diet has changed; if you take medicine for diabetes and your weight falls, the dose needs your doctor's review.

Does a vegan diet help with weight?

It can, though not because animal foods are fattening in themselves. In the trials pooled in 2022, people with overweight or type 2 diabetes lost 4.1 kg more on vegan diets than on control diets, and the authors attribute part of that to eating less energy. A vegan day heavy in fried food, sugar and refined flour has no such effect. NNWA's Weight Management course and the Plant-Based Nutrition course teach the planning for healthy adults.

Learning this with NNWA

Planning a vegan day against ICMR-NIN values is taught at NNWA, a private skill academy in Kolkata with online classes in English and Hindi. Courses such as the Diploma in Nutrition prepare people to coach healthy clients and to refer medical cases to a doctor. No NNWA course is a degree or a dietitian qualification.