Time (hours)
Glu
cose
co
nce
ntr
atio
n (
mg
/dl)
Insu
lin c
on
cen
trat
ion
(n
g/d
l)
0
50
100
150
200
250
0 8 16 24 32 40 48
Adaptation (G=I=1200h)Fast adaptation (G=I= 4h)
glucose
insulin
(a)
Time (hours)
Bra
in g
luco
se c
on
cen
trat
ion
(m
g/d
l)
15
18
21
24
27
30
0 8 16 24 32 40 48
Adaptation (G=I=1200h)Fast adaptation (G=I= 4h)
(b)