Ref. No. 2083/44-2082
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
In Islam, the concept of halal and haram is because of the command of Allah (sw). The things which have been declared haram by Allah or by His Prophet (saws) are Haraam forever. The basic concept of Islam is that if a doctor forbids someone from something with valid reason, and the patient refrains from the same. When we follow the prescription of doctor believing that whatever he has prescribed is useful for our health, then Allah Who is the Creator of this universe, if He commands to stay away from something for our physical or spiritual benefits, it is necessary for us to follow His orders. Whatever command we receive from Allah has wisdom behind it, though we know that wisdom or not.
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deoband