Are vegetarians? Are fish-eaters?
Obviously there are individual differences within each group, so safe yourself the trouble of going down this line of thought thinking you are all that.
A newly-published cross-sectional analysis investigated the differences in plasma concentrations (mass spectrometry) and in intakes (food frequency questionnaire) of amino acids between 392 male meat-eaters, fish-eaters, vegetarians and vegans.
Results as follows:
Intakes of all 18 dietary amino acids differed by diet group; for the majority of these, intake was highest in meat-eaters followed by fish-eaters, then vegetarians and lowest in vegans (up to 47% lower than in meat-eaters).
All in all, concentrations differed between groups; each group was high in some amino acids and low in others. However, a pattern – as indicated in the quote – appeared, indicating that vegetarians and vegans, on the whole, might be consuming insufficient amounts of protein. Even though the long-term health of people on a plant-based diet is quite good and possible superior to comparable omnivores, it is wellknown that it can be difficult to consume sufficient amounts of all the different amino acids when on a vegetarian/vegan diet, so for the majority the results from this study should come as no surprise. It should, however, serve as a reminder that – unless you are eating meat on a regular basis – you should take steps to ensure that you are getting enough protein from other sources.