Actually if we see the diet pattern and their food type during fasting Ramadan, it is quite obvious that it is different than daily pattern of diet they take whole of the year. Other reason that our biological clock of the body (For releasing enzyme and harmone that keep body equilibrium) is adopted for the life style pattern of rest of year wise (11 month) but when we start fasting in whole day and diet at evening and early morning with late night party, less sleep, it will mismatched with biological clock. Other many reason that may be associated are their sleep disturbance, whole day fasting of diabetic patient, tension for managing fast etc. Main strong reason is also very practical that they usually take heavy food to counter whole day fast. so all these factors collectively impact the health of diabetic patients adversely. Also the anti-diabetic drugs that are administered are generally following regular diet pattern so it may be advised that patients should be change their schedule of taking anti-diabetic drug. 

Elsalam 3likum  Dr. Ahmed 

I think not changing of diet time, but it may related to diet types. in Ramadan the most frequent diet is CHO like dessert, pastry, pasta pizza and etc ....

and also the life style of most people in this month, which they sleeping in day and watching  TV at night 

Ahmed, I tend to agree with Amar - I have heard about non-diabetic people who actually manage to gain weight during Ramadan, which might seem paradoxical but when think about caloric intake versus consumption during this month, it is far from surprising.

Actually if we see the diet pattern and their food type during fasting Ramadan, it is quite obvious that it is different than daily pattern of diet they take whole of the year. Other reason that our biological clock of the body (For releasing enzyme and harmone that keep body equilibrium) is adopted for the life style pattern of rest of year wise (11 month) but when we start fasting in whole day and diet at evening and early morning with late night party, less sleep, it will mismatched with biological clock. Other many reason that may be associated are their sleep disturbance, whole day fasting of diabetic patient, tension for managing fast etc. Main strong reason is also very practical that they usually take heavy food to counter whole day fast. so all these factors collectively impact the health of diabetic patients adversely. Also the anti-diabetic drugs that are administered are generally following regular diet pattern so it may be advised that patients should be change their schedule of taking anti-diabetic drug. 

Dear Ahmed,

Supposed people with diabetes are exempted from fasting specifically Type I. However, with special feeling in Ramdan people can not recognize to eat during Ramadan days. I know many patients weirdly control their blood sugar although they Type I, take two doses before sunset and dawn times. Sometimes they take extra insulin during fasting time when blood sugar is up. Desserts with syrup usually are eaten in Ramadan that makes blood sugar getting worse in addition to limited exercise apart from praying.

Good luck for fasting Ramadn