Dictionary

Flexitarian - It is a combination of the words "flexible" and "vegetarian" and refers mainly to non-vegetarians who occasionally eat meat or fish. https://www.frontiersin.org/articles/10.3389/fnut.2016.00055/full#B1  
Flexitarian (or flexible) Diets - It is primarily vegetarian but occasionally or in small quantities includes meat, dairy, eggs, poultry and fish.
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