obestiy Flashcards
(30 cards)
normal weight
18.5-24.9
underweight
<18.5
overneight
25-29.9
overweight
25-29.9
obesity 1
30-34.9
obesity 2
35-39.9
obesity III (extreme)
> 40
6.3% population
excess calories stored as
triglycerides in two ways–adipose cellular hyperplasia & adipose cellualr hypertrophy
adipose cellylar hyperplasia
increase in number of cells
early onset
extreme
adipose cellualr hypertrophy
increase in size only
adult onset
mild
weight loss leads to
change in adipose cell size but not number (this remains constant even with weight loss)–this is reason why weight loss is so hard and so often relapse
peptides and NT that increase appetite
NPY AGRP MCH Ghrelin* endocannabinoids Orexins* Galanin Opiods
peptides and nt that decrease appetite
leptin* a-MSH CRF CART Neuromedian Urocortin CCK* IL6 CNTF PYY oxyntomodulin
leptin is produced in
fat cells, gut, placenta
leptin
signals brain how much fat is stored
db/db and ob/ob mice
ob- deficient
db- defect
hyperphagia
insulin R
infertility
hyperinsulinemia
melanin protein (MSH)
inhibits food intake
agouti gene/protein
inhibits mSH binding to receptor–>decrease MSH–>stimulates food intake
also competes w/ MSH for Melacortin 4R
carboxypeptide E
cleaves proinsulin
*fat mice lack this
tub gene
retinitis, other neuro deficits–>hypothal damage–>stimulates appetite
M4R deletion
hyperphagia, obesity
M3R deletion
store more fat, lower lean body mass
5HT 2C deletion
increase food intake, obesity, seizures
5HT1B deletion
blocks anorexic effects dexfenfluramine