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glucose
the form of sugar that circulates in the blood and provides the major source of energy for body tissues. When its level is low, we feel hunger.
set point
the point at which an individual’s “weight thermostat” is supposedly set. When the body falls below this weight, an increase in hunger and a lowered metabolic rate may act to restore the lost weight.
basal metabolic rate
the body’s resting rate of energy expenditure.
Insulin
Hormone secreted by pancreas; controls blood glucose.
Ghrelin
Hormone secreted by empty stomach; sends “I’m hungry” signals to the brain.
Orexin
Hunger-triggering hormone secreted by hypothalamus.
Leptin
Protein hormone secreted by fat cells; when abundant, causes brain to increase metabolism and decrease hunger.
PYY
Digestive tract hormone; sends “I’m not hungry” signals to the brain.
Note 
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