What precautions should diabetic patient follow on this fast?

We would recommend a smoothie fast for diabetics. In place of bananas, you can add papaya to the smoothies. 

Important note regarding juices - 

• Pure Fruit juices / Coconut Water / Sweet Juices are strictly NOT allowed in the case of diabetes. They would overburden the pancreas. Please stick to juices of non-sweet vegetables like ash gourd, bottle gourd, cucumber, celery, spinach, coriander, etc. 

Important note regarding medication -

If at any point of time you feel low or your sugar levels drop below normal, please have 1 teaspoon of jaggery. If you are taking medication, please read the following:

The dosage of your medication should depend on your sugar levels, so please make sure to constantly check your levels. Taking the prescribed dosage without checking your levels, may reduce your levels below the safe levels and induce hypoglycaemia.

The above are general guidelines and should be followed with caution. Kindly seek permission from your medical doctor before fasting or making any changes to your medication.