A plant-based diet is a diet where you eat mostly plants like fruits, vegetables, grains, nuts, and seeds, and fewer foods that come from animals, like meat, dairy products, and eggs. Eating plant-based foods helps keep you healthy and can even help you live longer. It can also be good for the environment since growing plants usually uses less resources than raising animals. If you eat a plant-based diet, you don't have to eat only plants - you can still enjoy things like pizza, pasta, and sandwiches - you just have to choose plant-based ingredients like mushrooms, beans, and veggies instead of meat or dairy.