Why Do We Want to Eat

Why Do We Want to Eat - Why Do We Want to Eat? Food is...

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Why Do We Want to Eat? Food is intimately connected to our sense of taste, but also stimulates our senses of: Sight, Smell, Touch, Hear Appetite: Physiological desire to eat certain foods *The strong craving sensation we get even when we’re not hungry, is due to appetite. Hunger: Psychological sensation that prompts us to eat Satiety: the feeling of being full Signals that prompt us to eat: -Hunger is detected by the Hypothalamus – a region of the brain. -Blood glucose levels trigger the release of hormones called insulin and glucagon. -- The hypothalamus receives these hormone signals to tell us if we are hungry. Hormones: chemicals produced in specialized glands that travel in the bloodstream to target organs in other parts of the body *Some hormones stimulate food intake : ghrelin *Some hormones produce a feeling of satiety: Leptin _____________: 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. -Proteins have the highest satiety value -Carbohydrates have a lower satiety value than fats
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-Bulky foods provide a sense of satiety -Solid foods are more filling than semi-solid foods or liquids Organization of the Body *Carbohydrates, proteins, and fats are usually very large molecules with energy stored within the bonds . The goals of digestion 1. Break these large molecules down into smaller molecules so they can be absorbed into the bloodstream 2. Absorb the smaller molecules into the cells of the body, further breakdown the molecules and use the energy released for cellular activity Atoms: the smallest units of matter Molecules: groups of atoms bonded in specific configurations Example: water is H 2 O Cells: the smallest unit of life *Molecules that result from the digestion of food are used as energy and as building blocks for the cells of the body. Cell membrane : outer layer enclosing each cell of the body Cytoplasm: the liquid within the cell Organelles: tiny structures that perform many different cellular functions Tissue: group of cells acting together to perform a common function Examples: muscle tissue Organ: a body structure composed of two or more tissues and performing a specific function
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Example: the esophagus Organ systems : groups of organs working together for a particular function. Example: gastrointestinal system
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Why Do We Want to Eat - Why Do We Want to Eat? Food is...

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