Omega-3 Fatty Acids (ALA, EPA, DHA): Indian Requirement, Oil Balance and Sources

Omega-3 fatty acids are polyunsaturated fats that the body needs and cannot build from scratch. Plants supply alpha-linolenic acid (ALA); fish, other seafood and algae supply the longer EPA and DHA. ICMR-NIN's Dietary Guidelines for Indians 2024 set the minimum at 0.6 to 1.2 per cent of energy, about 2.2 g a day on a 2,000 kcal diet, and its 2020 requirements report asks for omega-6 and omega-3 to sit between 5:1 and 10:1. This entry in the fats section of the handbook shows how an Indian plate gets there.

What are omega-3 fatty acids, and why are there three of them?

They are three related fats that differ in chain length and in where they come from. ALA is made by plants, so it turns up in seeds, nuts, pulses, leafy vegetables and a few oils. EPA and DHA are longer, and they reach the plate through fish, other seafood, eggs in small amounts, and microalgae. Nutrition texts write the family as n-3. Linoleic acid, the main omega-6 fat, is the other essential fatty acid, and the two are always discussed together.

ICMR-NIN's 2024 guidelines describe what these fats do. Polyunsaturated fats are part of every cell membrane, and brain cells and nerve tissue hold high levels of the n-3 kind. DHA gathers quickly in the brain and retina of the foetus and young infant. The same document notes that EPA and DHA are biologically more active than the ALA of plant foods, which is why the form you eat matters as well as the amount.

How much omega-3 do you need under the Indian guidelines?

ICMR-NIN gives a share of energy and not a table of grams by age. Its Nutrient Requirements for Indians 2020 sets an acceptable range of 0.5 to 1 per cent of energy from n-3 fat for every group from one-year-olds to pregnant and lactating women. The 2024 guidelines put the minimum at 0.6 to 1.2 per cent, roughly 20 kcal or 2.2 g on a 2,000 kcal diet, beside a minimum of 3 per cent of energy, or 6.6 g, from omega-6. You can scale the figure to your own intake with the calorie calculator.

The EPA and DHA rows are not Indian figures. The summary tables of the 2020 report give no separate value for them, so the numbers come from the FAO/WHO expert consultation on fats published in 2010. What ICMR-NIN does say, in the 2024 guidelines, is that people who eat fish should prefer marine fish, about 200 g a week, and that pregnant women need particular attention to long-chain n-3 fats along with iron, folic acid, vitamin B12 and iodine.

Visible fat and the omega-6 to omega-3 balance in Indian kitchens

ICMR-NIN separates visible fat, meaning the oil, ghee, butter or vanaspati added in cooking or at the table, from the invisible fat already inside cereals, pulses, nuts and seeds. The 2020 report caps visible fat at 25, 30 and 40 g a day for men doing sedentary, moderate and heavy work, and at 20, 25 and 30 g for women. The 2024 guidelines give a wider range of 20 to 50 g, counted as four to ten teaspoons, and add that 27 to 30 g is enough on a 2,000 kcal diet.

Balance is the harder part. A review in the Indian Journal of Medical Research in 2016 described Indian diets as relatively low in saturated fat, high in omega-6 and very low in omega-3, with almost no long-chain n-3 at all. It pointed to the shift from traditional oils to sunflower and safflower, which are more than 60 and 70 per cent linoleic acid, and noted that only mustard, soyabean and canola oils carry a reasonable amount of ALA. The site's guide to which cooking oil suits an Indian kitchen compares them in use.

Read the table across, not down. Mustard oil has less than half the polyunsaturated fat of sunflower oil, yet more than two-fifths of it is ALA, so three teaspoons supply about 1.7 g of omega-3. Sunflower and safflower oil add a great deal of omega-6 and almost no omega-3. The page for mustard oil per 100 g has its full panel. None of this is a reason to pour more oil.

Which Indian foods supply omega-3?

For ALA, flaxseed, walnuts, garden cress seeds, mustard oil and soya lead by a wide margin, and for EPA and DHA the richest common fish in the Indian tables are hilsa, black pomfret and sardine. The table below turns the per 100 g values of the Indian Food Composition Tables 2017 into household portions. The ranked figures are on the omega-3 food table, and the entry for flaxseeds (alsi) has the rest of that seed's panel.

Fish values move with species, season and fat content, so treat each figure as the analysed sample and not a promise about every catch. Catla carries about five times the EPA and DHA of rohu in these tables. The 2024 guidelines estimate that 100 mg of long-chain n-3 comes from about 10 g of oily fish, 20 to 50 g of low or medium fat fish, or two to three ordinary eggs. Bengal's favourite is covered in hilsa nutrition and how often to eat it.

Can vegetarians get enough omega-3 without fish?

They can meet the ALA requirement comfortably, but the long-chain forms are a different matter. ICMR-NIN's 2024 guidelines name long-chain n-3 fats, with vitamin B12, as the nutrients of concern for vegetarians, and say that only a small amount of plant n-3 is converted to EPA and DHA in the body. Their advice is to make sure of flaxseed, chia seeds, walnuts and greens. The guidelines also list microalgae among the direct sources of DHA and EPA, which is the only route that involves no animal food.

Whether a healthy vegetarian adult needs ready-made DHA is not settled by the Indian documents, which stop at the food advice above. Pregnancy and breastfeeding are where the guidelines ask for most attention, and that is a conversation for the antenatal visit, not a decision to make at a shop shelf. Capsules, algal oil and label reading are covered in omega-3 foods and capsules.

Too little and too much: where the risk lies in India

No national survey that this entry could open reports omega-3 status in Indians, so there is no prevalence figure to quote. What exists is intake reasoning. The 2016 Indian review judged long-chain n-3 intake in India to be negligible and the omega-6 to omega-3 ratio to be skewed by modern oils. The groups with least margin are strict vegetarians who cook in sunflower or safflower oil, and pregnant and lactating women, for whom FAO/WHO sets the higher EPA plus DHA value.

ICMR-NIN sets no upper limit for omega-3. FAO/WHO puts the upper end of its acceptable range for EPA plus DHA at 2 g a day, citing experimental evidence that high supplement intakes may increase lipid peroxidation. A 2021 meta-analysis in Circulation of seven trials and 81,210 patients found that marine omega-3 supplements were associated with a higher risk of atrial fibrillation, an irregular heart rhythm: the hazard ratio was 1.25 overall, 1.12 in trials using 1 g a day or less, and 1.49 in trials using more. Food sources were not the subject of those trials.

What does the trial evidence say about omega-3 and the heart?

Less than the capsule shelf suggests. The Cochrane review of 2020 pooled 86 randomised trials with 162,796 participants, most of them testing EPA and DHA capsules for at least a year. It found little or no effect on deaths from any cause or on cardiovascular events, with high certainty. There may be a slight reduction in coronary deaths and coronary events, on low-certainty evidence: 167 people would need to raise their intake to prevent one coronary event. The clearest effect was on blood triglycerides, which fell by about 15 per cent.

The same review looked at ALA from plants. Eating more of it probably makes little or no difference to deaths, and may slightly reduce cardiovascular events, with 500 people needing to raise intake to prevent one event. In pregnancy the picture is firmer. A Cochrane review of 70 trials and 19,927 women found fewer preterm births before 37 weeks with long-chain omega-3, 11.9 per cent against 13.4 per cent, on high-quality evidence, and more pregnancies running past 42 weeks, 2.6 per cent against 1.6 per cent. Most of those trials were run in upper-middle or high-income countries.

A worked example: a vegetarian day at 2,000 kcal

This is an illustration, not a real person. Take a 34-year-old vegetarian accountant in Pune who eats about 2,000 kcal a day and cooks with 25 g of sunflower oil, which has no ALA value in the Indian tables. Her rajma at lunch (30 g raw) gives 0.17 g and 100 g of methi leaves in the evening sabzi gives 0.36 g, so the day totals about 0.5 g of omega-3 against a minimum of 2.2 g, with plenty of omega-6 from the oil.

Two changes close the gap without adding oil. A tablespoon of flaxseed stirred into her curd adds 1.9 g and takes the day to about 2.4 g. Or she replaces 15 g of the sunflower oil with mustard oil, which adds 1.7 g and reaches about 2.2 g while cutting omega-6 at the same time. Both routes supply ALA only. Neither tells her how much EPA and DHA her body makes from it.

Common mistakes with omega-3

The second mistake is to count the seeds and forget the oil. A spoon of flaxseed helps, but a kitchen that cooks everything in sunflower oil is still supplying omega-6 far faster than omega-3, and the ratio is what ICMR-NIN asks you to watch. The third is to add flaxseed oil on top of the usual cooking oil, or to fry in it. Extra oil is still visible fat, and the 2024 guidelines warn that repeated heating oxidises polyunsaturated fat into harmful compounds.

When should you see a doctor before taking omega-3 capsules?

Speak to your doctor first if you have a heart rhythm problem or any heart disease, if you take prescribed medicines every day, if you are pregnant or breastfeeding, or if surgery is planned. The trials above link supplement doses, particularly above 1 g a day, with atrial fibrillation. Do not start, stop or change a medicine because of something you read about omega-3. Food sources at ordinary portions need no clearance for a healthy adult.

Learning this properly

Fats are taught in NNWA's courses as one part of planning a balanced diet. NNWA is a private skill academy in Kolkata that teaches online in English and Hindi; its courses train people to coach healthy clients and to refer medical cases, and none of them is a degree or a dietitian qualification. The Certification in Nutrition is the starting point, and the Diploma in Nutrition, Dietetics and Public Health goes further into requirements and diet planning.