“The lower proportions of DHA are accompanied by correspondingly higher proportions of the long-chain derivatives of linoleic acid, indicating that the capacity to synthesize long-chain polyunsaturated fatty acids is not limited. Short-term dietary supplementation with alpha-linolenic acid increases the proportion of eicosapentaenoic acid (20:5n-3) but does not increase the proportion of DHA in blood lipids. Small amounts of preformed DHA (as low as 200mg) result in a large increase in the proportion of DHA in blood lipids in vegetarians and vegans. There is no evidence of adverse effects on health or cognitive function with lower DHA intake in vegetarians.”
Vegetarians and vegans can synthesize all the essential fats they need.
Also, the idea that low omega 3 MAY be a risk factor is not as confident a risk assessment as cholesterol, blood pressure, or saturated fat intake, or animal protein intake. Cholesterol only comes from animals and animal products! Blood pressure is increased as arteries become clogged with cholesterol from animal sources. If you can find a study NOT funded by an egg, dairy, or meat association that shows cholesterol does not correspond with a risk increase of heart disease, please show me it. Omega 3 ratio is the LEAST of people’s worries with regards to heart disease.