USMLE Forum Archives - USMLE Step 1 - Starvation
Starvation
bingousmle - 05-22-10 06:49
During prolonged starvation, the central nervous system will use which of the following as its primary fuel source?
(A) glucose
(B) fatty acids
(C) protein
(D) glycogen
(E) ketones
bingousmle - 05-22-10 06:49
During prolonged starvation, the central nervous system will use which of the following as its primary fuel source?
(A) glucose
(B) fatty acids
(C) protein
(D) glycogen
(E) ketones
The correct answer and explanation will be available after you answer.
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#1
Re: Starvation shumayla - 05-22-10 08:58 My answer is: e.
In the brain, they are a vital source of energy during fasting.
#4
Re: Starvation babbu5508 - 05-22-10 14:31 My answer is: e.
brain – glucose exclusively (120g/d) until prolonged starvation (~2 days) then switches to ketones (fuel sparing)..................or fatty acids
#9
Re: Starvation babbu5508 - 05-23-10 02:15 Medical reasons for starvation
Anorexia nervosa
Bulimia nervosa
Coma
Major depressive disorder
Diabetes mellitus
Digestive disease
#10
Re: Starvation mtniharika - 05-23-10 03:41 My answer is: e.
the only available nutrient for brain in normal people is glucose...A further peculiarity is that ketones are the only other available alternative to glucose for supplying energy to the brain.
#11
Re: Starvation
bingousmle - 05-23-10 05:22 yeah sure these diseases are associated with starvation Anorexia nervosa Bulimia nervosa Coma Major depressive disorder Diabetes mellitus Digestive disease
#12
Re: Starvation mtniharika - 05-23-10 15:41 Refeeding syndrome is a syndrome consisting of metabolic disturbances that occur as a result of reinstitution of nutrition to patients who are starved or severely malnourished.
#14
Re: Starvation babbu5508 - 05-24-10 00:39 good remembrance about refeeding syndrome..Refeeding syndrome occurs when previously malnourished patients are fed with high carbohydrate loads, the result is a rapid fall in phosphate, magnesium and potassium, along with an increasing ECF volume, leading to a variety of complications.
#15
Re: Starvation bingousmle - 05-24-10 00:47 @ mtniharika and babbu...
good revision of relevant concepts a clinician needs to keep in mind while treating patients... keep the info coming... its gonna help all of us :)
#16
Re: Starvation babbu5508 - 05-24-10 02:01 yes bingo...and thank you for putting such important questions which gives us a scope to revise and learn new concepts..that we may forget.
#17
Re: Starvation bingousmle - 05-24-10 02:02 
posted by babbu5508 on 05-24-10 02:01
yes bingo...and thank you for putting such important questions which gives us a scope to revise and learn new concepts..that we may forget.
yes bingo...and thank you for putting such important questions which gives us a scope to revise and learn new concepts..that we may forget.
sure!
#21
Re: Starvation mtniharika - 05-25-10 03:54 posted by bingousmle on 05-24-10 00:47
@ mtniharika and babbu...
good revision of relevant concepts a clinician needs to keep in mind while treating patients... keep the info coming... its gonna help all of us :)
@ mtniharika and babbu...
good revision of relevant concepts a clinician needs to keep in mind while treating patients... keep the info coming... its gonna help all of us :)
yeah sure
#23
Re: Starvation galaxy - 05-26-10 02:45 My answer is: e.
in starvation, RBCs and brain cells depend exclusively on glucose as a source of food followed later by ketones
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