Vegetarianism is the practice of not eating meat, including beef, poultry, fish, or their by-products, with or without the use of dairy products or eggs. The exclusion may also extend to products derived from animal carcasses, such as lard, tallow, gelatin, rennet and cochineal. Some who follow the diet also choose to refrain from wearing products that involve the death of animals, such as leather, silk, fur and many or all down feathers. It should be noted that although many vegetarians abstain from all animal by-products, others make exceptions in their diet and attire. Vegetarians may consume dairy and egg products; a stricter form is veganism, which excludes dairy, eggs, and any foods that contain these or other animal products; still stricter is fruitarianism, which excludes all food but the botanic fruits of plants.