nslecture18 notes 1 - Lecture 18: Part I Theories of Eating...

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Lecture 18: Part I Theories of Eating Behavior : Biological vs. Environmental A. Environmental – minority of people believe what you eat is controlled by your environmental B. Biological – most people believe these dominant set of theories: eating behavior tied biologically to energy balance and we have mechanisms that constantly regulate what when and why we eat C. strongest argument – of those who support biological theory - look at long-term energy balance over a period of year : avg person eats 730,000 kCal a year - average american gains ½ pounds a year = 1,750 kCal - only ate an excess of 1,750 kcal/year – error of .24% - argue that you must have some type of energy regulation taking place because such precision must be close controlled - think that there must be physiolical regulatory mechanisms – type of energy regulation to regulate such tight control and precision so it must be biological III. Oldest theories of Eating - most people say they eat because they feel their stomach empty - this feeling is stimulated by local sensors – found in the stomach - stomach small tight state when empty, after eating a meal – stomach stretches. Stretch receptors on stomach – send signals to the vagus (a parasympathetic nerve) -vagus nerve – contains both downstream(signals from brain to stomach) information and upstream information (signal sent in response to stomach stretching) - no one knows if this is the sole determinant in regulating eating; but surgeons have done most with this receptor system – tried to treat obesity by altering stomach in order to reduce the amount of energy you consume 1. Surgeon #1 – Gastric Stapling - stapling stomach – reduced volume of stomach by nearly ½ - proved somewhat effective – people who have their stomach stapled do reduce intake and thus lose fat - but problems: people undergoing this often eat a maximum amount of food in order to compensate in reduction in size – which pushes against the staples which can come out
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This note was uploaded on 03/16/2010 for the course NS 1150 at Cornell University (Engineering School).

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nslecture18 notes 1 - Lecture 18: Part I Theories of Eating...

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