Overview of PBD sub-groups. Flexitarian: focused on plant foods, but meat and other animal products are allowed in moderation (semivegetarianism) (18).

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... vegetarian diet comprises various subgroups that include or exclude certain animal products. Pesco-vegetarians, for example, eat fish and honey, while ovolacto-vegetarians include eggs, dairy products, and honey in their diet, but no fish ( Figure 1) (15). Due to the inherent differences between PBDs, their effects on health and longevity may differ and are not readily transferable from one type of PBD to another, especially between vegan and vegetarian diets. ...