Dear Friend. Hepatitis A
is transmitted by faeco oral route.
If he has improved, his liver
functions have settled, he can resume his gym.
Ask him to carry his own water to gym.
Regarding protein supplements
, see excess of everything is bad.
In relation to hepatitis A, he can consume high protein diet if he has recovered and has no encephalopathy
that is disorientation
, disturbance in consciousness which may occur during the course of hepatitis A infection, and during that period low protein diet
If he has recovered totally he can do his workouts and consume protein supplements in moderated quatities.