Algae Oil or Fish Oil? Omega-3 Options for Indian Vegetarians

If you don't eat fish, you've probably been told to eat flaxseed or walnuts for omega-3. That helps, but it isn't the whole story. We covered why omega-3s matter for Indian hearts in an earlier Journal post. This one is about the vegetarian problem and how to solve it.

If you want the deeper fish-oil quality guide, see our earlier omega-3 post.

Not all omega-3s are equal

There are three main types:

• ALA from flaxseed (alsi), chia, walnuts, mustard oil and soybean oil.

• EPA and DHA, found mainly in oily fish like mackerel (bangda), sardines (mathi) and salmon.

EPA and DHA are the ones most linked to heart, brain and eye health. Your body can turn ALA into them, but poorly. Studies estimate conversion to EPA at a few percent and to DHA often below 1%. So a vegetarian eating plenty of flax can still have low EPA and DHA in the blood, and studies of vegetarians and vegans show exactly that.

There's another twist for Indian kitchens. Many of us cook in oils high in omega-6 like sunflower and safflower. Omega-6 competes with ALA for the same conversion enzymes, which may lower that conversion further.

Where fish get their omega-3

Fish don't make EPA and DHA themselves. They get it from the microalgae at the bottom of the food chain. Algae oil simply skips the fish and goes straight to the source.

Algae oil vs fish oil

Fish oil - Long track record. Most of the big omega-3 trials used fish oil. - Usually cheaper per mg of EPA + DHA. - Not vegetarian. Some people get a fishy aftertaste or burps. - Quality depends on purification for mercury and other contaminants.

Algae oil - Vegetarian and vegan. - Grown in controlled tanks, so contaminant risk is low. - Studies show algae DHA raises blood levels about as well as fish DHA. - Often DHA-heavy with less EPA, and costs more.

How much

There's no single Indian target, but many expert groups suggest around 250 to 500 mg of combined EPA + DHA a day for general health in adults. Check the label for actual EPA and DHA, not just "1000 mg algae oil" or "1000 mg fish oil".

Food first, then fill gaps

• Use 1 to 2 tablespoons of ground flaxseed a day. Whole seeds often pass through undigested.

• Add walnuts or chia a few times a week.

• Swap some sunflower oil for mustard oil or cold-pressed groundnut oil to balance omega-6.

• If you eat fish, two servings of oily fish a week covers most people.

Who should be careful

Omega-3 at higher doses may thin the blood slightly. If you take blood thinners or have surgery coming up, speak to your doctor. Pregnant women often benefit from DHA, but should choose a product with their doctor.

The short version

For vegetarians, flax and walnuts are good but probably not enough for EPA and DHA. An algae oil supplement is the closest vegetarian match to fish oil.

This article is for general information only and is not medical advice. Supplements are not meant to diagnose, treat, cure or prevent any disease. Speak to your doctor before starting anything new, especially if you are pregnant, breastfeeding, on medication or managing a health condition.

References

1. Burdge GC, Calder PC. Conversion of alpha-linolenic acid to longer-chain polyunsaturated fatty acids in human adults. Reprod Nutr Dev. 2005.

2. Rosell MS, et al. Long-chain n-3 polyunsaturated fatty acids in plasma in British meat-eating, vegetarian, and vegan men. Am J Clin Nutr. 2005.

3. Arterburn LM, et al. Algal-oil capsules and cooked salmon: nutritionally equivalent sources of docosahexaenoic acid. J Am Diet Assoc. 2008.

4. EFSA Panel on Dietetic Products. Scientific opinion on dietary reference values for fats. EFSA J. 2010.