The answer is as simple as eating whole plant foods: grains, fruits, vegetables
A whole foods plant based diet means no meat (no beef, pork, chicken or fish), no dairy, no eggs, no vegetable oil and no processed foods like cookies, cakes, potato chips.
Choose natural foods from the produce section of your food store.
Choose whole grains (brown rice, whole wheat) rather than refined grains.
Also you must avoid fried foods.