Fruitarianism is a nutrition system and a lifestyle. The diet consists of only raw fruit and seeds and other plant matter that can be gathered without harming the plant. These fruits include pineapple, mango, banana, avocado, apple, melon, orange, all kinds of berries, tomatoes, cucumbers, olives, nuts, hazelnuts, cashews, and chestnuts. Some fruitarians eat only plant matter that has already fallen off the plant. Thus, a fruitarian will eat beans, tomatoes, cucumbers, pumpkins, and the like, but will refuse to eat potatoes or spinach. Fruitarians may be motivated by the religious faith of the Old Testament dating back to the diet of Adam and Eve.