Fructarians are a subgroup of vegans who eat only the fruit of plants. That sounds extremely limiting at first, but that includes not only what one typically thinks of as a "fruit" in the supermarket sense such as apples and oranges, but also other foods that are botanically the fruits of flowering plants (that is, the seed-containing reproductive parts), including all berries, nuts, seeds, peppers, tomatoes, squash, beans, peas, grains, and other common foods.
By eating only the fruit of a plant, the plant does not have to be killed (when you eat a carrot, which is the root of a plant, the whole carrot plant dies). In many cases, eating fruit does the parent plant a favor. All fleshy fruit is designed to be eaten by animals and either travel through the animal's digestive tract before it sprouts in a pile of ready-made fertilizer; or, in the case of fruits with cores or pits, to be carried away from the parent plant, eaten, and the core or pit which contains the seeds or is the seed, tossed aside to sprout. Without animals eating fruit, the fruit would not travel far enough away from the parent plant to grow successfully. Many plants depend on animals for seed dispersal.