Intermittent fasting and type 2 diabetes

Fasting removes a usual opportunity to eat carbohydrates and take some medicines. Depending on treatment, this can lead to hypoglycaemia, while dehydration or illness can push glucose higher. The response may vary with kidney function, activity, meal composition, and the length of the fasting window. Fasting does not replace prescribed treatment. People with diabetes may also have related concerns such as chronic kidney disease, obesity, peripheral neuropathy, or peripheral arterial disease, which can change the safety discussion.

Speak with your diabetes clinician before starting or extending a fast. Agree which medicines require adjustment, when to check glucose, what readings or symptoms mean you must break the fast, and how to manage exercise. Keep fast-acting glucose available if your clinician recommends it, and drink according to your medical advice. Do not omit or double medicines on your own. Break the fast and follow your sick-day or low-glucose plan if you feel shaky, sweaty, confused, unusually weak, or unwell.

Get emergency help for severe confusion, seizure, loss of consciousness, chest pain, severe breathlessness, or signs of stroke such as sudden facial weakness, arm weakness, or speech trouble. Contact your diabetes team promptly for repeated low or high readings, vomiting, inability to drink, or glucose symptoms that do not settle after following your plan.

Is fasting appropriate with my medicines and kidney function? When should I check glucose, exercise, or break the fast? What treatment changes and warning signs should be written into my plan?