Keeping healthy during Ramadan

How you can make sure you stay healthy during Ramadan:

Always maintain a balanced diet and drink adequate fluid between fasts
If your health is at risk because of serious illness, old age or pregnancy, speak to your doctor to check if it is safe for you to fast. Allah has given permission in the Quran to break the fast on medical advice.
Keep all medical appointments in Ramadan, or reschedule for immediately after if you feel you really can't attend. If you are undergoing tests or investigations for cancer, it is particularly important you keep your appointment during Ramadan
If you take medication such as tablets or insulin to control your diabetes, please speak to your GP before Ramadan starts to find out if it is safe to fast. It can be extremely dangerous to alter times of medication or to take drugs that require food on an empty stomach
If fasting is not recommended by your GP or hospital team, the Islamic ruling is that you should not fast during Ramadan and should instead make a charitable donation (fidyah)
If you have high blood pressure or asthma, you will probably have been prescribed medication to control your illness. It is important that these medications are taken regularly, every day.

Source: www.bartsandthelondon.nhs.uk/forpatients/ramadan