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Unformatted text preview: Nutrition Chapter 2, the Human Body 04/02/2008 16:03:00 ← Why do we want to eat? • Signals that prompt us to eat o Hunger is detected by the hypothalamus, a region of the brain o Blood glucose levels trigger the release of hormones called insulin and glucagons o The hypothalamus receives these hormone signals to tell us when we’re hungry. • Hormones: chemicals produced in specialized glands that travel in the bloodstream to target organs in other parts of the body. o Some hormones stimulate food intake Ghrelin o Some hormones produce a feeling of satiety Leptin • Nervous system: nerves along the GI tract also signal “full” or “empty” to the hypothalamus and contribute to hunger and appetite hormones. • Foods have differing effects on our feelings of hunger o Proteins have the highest satiety value o Carbs have a lower satiety value than fats o Bulky foods provide a sense of satiety o Solid foods are more filling than semi-solid foods or liquids ← Organizations of the Body • Carbs, proteins, and fats are usually very large molecules with energy stored within the bonds • The goals of digestion • Atoms: the smallest unit of matter o Atoms bond to each other to form molecules Molecules- groups of atoms bonded in specific configurations...
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This note was uploaded on 04/02/2008 for the course NATS 104 taught by Professor Lewis during the Spring '08 term at Arizona.
- Spring '08