@AstridRogue101, you won't have a Vegetarian trait unless you have the City Living EP installed. 😉 But as @jpkarlsen said, many dishes are marked as vegetarian safe. This is useful even if you don't make your Sim a vegetarian because they might have guests visiting who are Vegetarian, and therefore they know which meals are safe to cook! 😇 No good host wants to make their guests sick! 🤒😃
Also, there is no meat-eating trait or Vegan trait in the game. (Vegans are not allowed any animal products, so eggs and dairy are forbidden. Vegetarians can eat animal products if it doesn't kill the animal, so dairy and eggs are allowed.) So in the game, there is only the Vegetarian trait, as you will notice that many of the Vegetarian-safe meals have eggs or cheese in them. 😉