What would happen biologically if humans changed their trophic level position?

What would happen biologically if humans changed their trophic level position?
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At the moment humans can be at different trophic levels depending on what they eat. A vegetarian is at the second trophic level as s/he eats only plants. Someone who ate only grazing animals would be at the third level. If you eat a carnivore such as a tuna fish you are at the fourth level. Most of us eat both plants and animals so we don't really have a level. That said, if we all moved to a specific diet there would probably be gradual genetic changes to favour our coping with that. We see some evidence of this in isolated groups with restricted diets today.
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