social omnivore noun [C]
UK /ˌsəʊ.ʃəl ˈɒm.nɪ.vɔːʳ/ US /ˌsoʊ.ʃəl ˈɑːm.nɪ.vɔːr/
a person who never eats meat at home but sometimes eats it when in a restaurant or at someone else’s house

Levy is part of a growing number of people who seek a middle ground. They’re social omnivores—vegetarian at home but sometimes partake in meat when out with friends and family. It’s different from following vague flexitarian or reducetarian principles, which both eschew clear-cut rules in favor of generally prioritizing plants over animals. Social omnivores, on the other hand, have one very clear boundary: They don’t buy or cook meat at home.
[bonappetit.com, 4 January 2023]

sustainatarian noun [C]
UK /səˌsteɪn.ɪˈteə.ri.ən/ US /səˌsteɪn.əˈter.i.ən/
a person who only eats food that has been produced in a way that causes little or no damage to the environment, and usually very little meat or fish

Sustainatarians orient their diet towards reducing food waste as well as reducing consumption of animal products, according to Vox. Sustainatarians might eat homegrown vegetables, or even hunt overpopulated animals for food using humane and sustainable methods rather than buy factory-farmed meat from the grocery store.
[tastingtable.com, 2 February 2023]

regenivore noun [C]
UK /ˌrɪˈdʒen.ɪ.vɔːʳ/ US /ˌrɪˈdʒen.ə.vɔːr/
a person who tries to actively stop or reverse the damage being done to the environment through the foods they choose to buy and eat

In addition to environmental concerns, regenivores take a big-picture view of the landscapes where food is grown, how livestock is raised, and how the people who produce and harvest food are treated … And when you consider the many threats facing planet earth, it’s easy to see why regenivores are growing in number.
[thedailymeal.com, 28 December 2022]

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