Digestion releases what kind of energy

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Understanding Chemical Digestion. Chemical vs. How is chemical digestion different from mechanical digestion? Where does chemical digestion begin? What path does chemical digestion follow? The bottom line. Read this next. How Is Protein Digested? How Are Carbohydrates Digested? Jejunum Overview. What's Possible from Microbiome Testing at Home? Medically reviewed by Debra Rose Wilson, Ph. What Is Cholangitis? Gastroparesis Diet. Medically reviewed by Amy Richter, RD.

Medically reviewed by Saurabh Sethi, M. Enzymes 6. Cell Respiration 9. Photosynthesis 3: Genetics 1. Genes 2. Chromosomes 3. Meiosis 4. Inheritance 5. Genetic Modification 4: Ecology 1. Energy Flow 3.

Carbon Cycling 4. Climate Change 5: Evolution 1. Evolution Evidence 2. Natural Selection 3. Classification 4. Cladistics 6: Human Physiology 1. Digestion 2. The Blood System 3. Foods are composed chiefly of carbohydrates, fats, proteins, water, vitamins, and minerals. Carbohydrates, fats, proteins, and water represent virtually all the weight of food, with vitamins and minerals making up only a small percentage of the weight.

In fact, carbohydrates, fats, and proteins comprise ninety percent of the dry weight of foods. Organisms derive food energy mainly from carbohydrates and fats present in the diet, and to a smaller extent proteins and other organic molecules. Some diet components that provide little or no food energy, such as water, minerals, vitamins, cholesterol, and fiber, may still be necessary to health and survival for other reasons.

Water, minerals, vitamins, and cholesterol are not broken down; they are used by the body in the form in which they are taken in, so they cannot be used for energy. Fiber, a type of carbohydrate, cannot be completely digested by the human body so energy is not released from fiber when it is digested. Instead, it moves mostly intact through the digestive system.

After you put food into your mouth, you begin to break it down mechanically using your teeth.