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Nutrition Chapter 2

Nutrition Chapter 2 - Nutrition Chapter 2 the Human Body...

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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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