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Case Study: Intermittent Fasting and Reversing Insulin-Dependent Type II Diabetes

reversing-insulin dependent Type II diabetes

In this just released case study, physicians are actually reversing insulin-dependent Type II diabetes with intermittent fasting. In the study, reported in the British Medical Journal, Case Reports (BMJ Case Reports), patients were able to stop using insulin within a month (one case within 5 days). While this is an observational study, with only 3 patients, the turn around was remarkable and worth considering for your practice.

“The use of a therapeutic fasting regimen for treatment of [type 2 diabetes] is virtually unheard of,” write the authors. “This present case series showed that 24-hour fasting regimens can significantly reverse or eliminate the need for diabetic medication,” the researchers conclude.

Click on the image to purchase The Complete Guide to Fasting from Amazon

This study used a diet from the The Complete Guide to Intermittent Fasting, by Jason Fung MD. In his book, Dr. Fung explains that by regularly lowering insulin levels, the body becomes more responsive to insulin. High insulin resistance, the opposite of insulin sensitivity, is at the root cause of Type-2 diabetes, as well as many other conditions, including cardiovascular disease, obesity, high cholesterol, fatty liver disease, gout, GERD, sleep apnea and even cancer.

A link to a the full text of this study and a Google Books preview of Fung’s book is available at the end of this post.

Three men, aged between 40 and 67, tried out planned intermittent fasting to see if it might ease their symptoms. They were taking various drugs to control their disease as well as daily units of insulin. In addition to type 2 diabetes, they all had high blood pressure and high cholesterol.

  • Patient 1 is a 40-year-old man diagnosed with T2D for 20 years. Other significant medical history includes hypertension and hypercholesterolaemia. His diabetic pharmacotherapy at the time of admission was insulin glargine 58 units at bedtime, insulin aspart 22 units twice daily, canagliflozin 300 mg once daily and metformin 1 g twice daily.

  • Patient 2 is a 52-year-old man diagnosed with T2D for 25 years. Other significant medical history includes chronic kidney disease, renal cell carcinoma (treated with previous nephrectomy), hypertension and hypercholesterolaemia. His diabetic pharmacotherapy at the time of admission consisted of insulin lispro mix units −38/32 25 IU twice daily.


  • Patient 3 is a 67-year-old man diagnosed with T2D for 10 years. Other significant medical history includes hypertension and hypercholesterolaemia. His diabetic pharmacotherapy at the time of admission consisted of metformin 1 g twice daily and insulin lispro mix 25–30 units in the morning and 20 units at night.

All patients followed similar dietary regimen. Patients 1 and 3 followed alternating-day 24-hour fasts, and patient 2 followed the triweekly 24-hour fasts schedule. On fasting days, the patients only consumed dinner, whereas on non-fasting days the patients consumed lunch and dinner. Low-carbohydrate meals were recommended when eating meals. Patients were examined on average twice a month and labs were recorded.

Before embarking on their fasting regime, they all attended a 6-hour long nutritional training seminar, which included information on how diabetes develops and its impact on the body; insulin resistance; healthy eating; and how to manage diabetes through diet, including therapeutic fasting.

They stuck to this pattern for around 10 months after which fasting blood glucose, average blood glucose (HbA1c), weight, and waist circumference were re-measured. All three men were able to stop injecting themselves with insulin within a month of starting their fasting schedule. In one case this took only five days.

Two of the men were able to stop taking all their other diabetic drugs, while the third discontinued three out of the four drugs he was taking. They all lost weight (by 10-18%) as well as reducing their fasting and average blood glucose readings, which may help lower the risk of future complications, say the authors. Feedback was positive, with all three men managing to stick to their dietary schedule without too much difficulty.


  • Medically supervised, therapeutic fasting regimens can help reverse type 2 diabetes (T2D) and minimize the use of pharmacological and possibly surgical interventions in patients with T2D.

  • Therapeutic fasting is an underutilized dietary intervention that can provide superior blood glucose reduction compared with standard pharmacological agents.

  • Fasting is a practical dietary strategy.

  • With proper education and support, we found compliance to be good.

Source: Suleiman Furmli, Rami Elmasry, Megan Ramos, Jason Fung. Therapeutic use of intermittent fasting for people with type 2 diabetes as an alternative to insulin. BMJ Case Reports, 2018; bcr-2017-221854

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