Leptin Theory Leptin Leptin is a protein produced by bloated fat cells. Hypothalamus senses rises in leptin and will curb eating and increase activity.

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Presentation transcript:

Leptin Theory Leptin Leptin is a protein produced by bloated fat cells. Hypothalamus senses rises in leptin and will curb eating and increase activity Hypothalamus senses rises in leptin and will curb eating and increase activity. Set Point Theory Hypothalamus acts like a thermostat. Hypothalamus acts like a thermostat. We are meant to be in a certain weight range. When we fall below weight our body will increase hunger and decrease energy expenditure (Basic Metabolic Rate). What happens if we go above our set point? Two Theories

LATERAL HYPOTHALAMUS When stimulated it makes you hungry. When lesioned (destroyed) you will never be hungry again. VENTROMEDIAL HYPOTHALAMUS When stimulated you feel full. When lesioned you will never feel full again.

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Once we become fat we require less food to maintain our weight than we did to attain it? Why? Because compared with other tissue, fat has a lower metabolic rate, it takes less food energy to maintain. When an overweight person’s body drops below it previous set point the person’s hunger increases and metabolism decreases. Thus the body adapts to starvation by burning off fewer calories.

Realistic and moderate goals, undertaking programs that modify their life style and ongoing eating behavior. Lose weight gradually.

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