Hydrochloric acid also kills bacteria that have entered the body with the food. Fats are made up of carbon, hydrogen, and oxygen but they contain less oxygen than carbohydrates. Fats are obtained from meats, dairy products, nuts, seeds, and vegetable oils. Large amounts of water are absorbed into the blood stream from the materials in the large intestine. The remaining solid materials are eliminated from the body through the rectum and the anus.
Elements used in small amounts are nutriments known as minerals.
Most are supplied through foods. Vitamin D is made when your skin is exposed to sunlight. It is used to make muscles,tendons, ligaments, blood, enzymes, cell membranes, antibodies, and hormones. Proteins contain carbon, hydrogen, oxygen, nitrogen and sometimes sulfur and phosphorus. Many of these amino acids are constructed in the cells with materials provided by digestion.