Drinking coffee could interfere with your fasting objectives by altering your insulin levels or the quality of sleep.
Coffee has almost little calories or nutrients and should not break your fast.
Coffee consumption during a fast is conditional on the kind of fast being observed and the reason for the fast.
Black coffee is OK to drink if you are following an intermittent fasting regimen. It's best to cut down on sugar and creamer to lose weight.
Although black coffee is OK to take before most blood tests, it is not recommended to drink any kind of coffee when fasting for surgery.
Seek the advice of your physician. When fasting for religious reasons, the strictness or laxity of the practise dictates whether or not coffee is permitted.
Coffee may be used during a fast, but only in moderation. Don't ruin your fast with coffee additives like sugar and milk.