Plant-based diets are popular because of their benefits to the earth, health and animals. Nowadays, more and more supermarket stores and restaurants offer vegetarian food options, so it becomes easier to have plant-based diets. Choosing a vegetarian diet means that you need to pay special attention to whether you meet the required nutritional needs, because it is more difficult to obtain certain vitamins and nutrients in non-meat foods. Here are some vitamins or nutritional supplements that vegetarians need to add.