It’s not an exact science, so choose to eat what you’re craving and what feels right for you. Just try to avoid a super large cut of meat so you won’t have any digestive discomfort. If you’ve been a vegan for a long time, or you’ve been following a strict plant-based diet, start with something lighter such as chicken broth or eggs.
For example, you might go with a higher-fat fish like salmon or herring over lean fish like tilapia and halibut.
You may want to avoid sushi if raw fish is unappealing to you.
Many people are vegetarians for moral reasons, so it can really make them upset if they have to start eating meat again.