A new study from New Zealand suggests intermittent fasting is good for someone living with Type 2 diabetes. Since then Divabetic’s social media feed is blowing up with story after story about this topic. We reached out to our friend and colleague, Registered Dietitian, Certified Diabetes Educator, Jill Weisenberger MS, RDN, CDE, CHWC, FAND to help us understand what intermittent fasting is and why or why not we might want to include it fasting in our diabetes self-management. Here’s her response:

Q: what is intermittent fasting?

Jill Weisenberger (JW): There are a variety of approaches, but they all put emphasis on restricting eating at certain times. One common version of IF is the 5:2 plan, which means to eat healthfully and normally for 5 days of the week and to restrict eating to just a few hundred calories 2 days per week. Another form of IF is to extend the overnight fast to 12 or even 16 hours.

Q: I’ve read that intermittent fasting can help with weight loss and lowering A1C. Are these outcomes realistic for people with type 2 diabetes?

JW: Some studies do show improvements in weight and blood glucose control and even insulin sensitivity. However, when these IF diets are compared to other dietary strategies for weight loss, the results aren’t so clear that one way is better than another. IF, especially the 5:2 plan, can increase the risk of hypoglycemia in anyone taking a medication that has hypoglycemia as a side effect. There may be populations in which IF is a potentially harmful, such as pregnant women, adolescents and people with eating disorders.

My limited experience with the 5:2 plan suggests that it makes daily exercise very hard.

Q: Can intermittent fasting help people with prediabetes? If so, why? If not, why?

JW: If the person with prediabetes is overweight and if IF leads to weight loss, then yes, IF can help people with prediabetes. There was one study in men with prediabetes who were instructed to eat only during 6 hours of the day and to fast for the other 18. Compared to people eating for 12 hours and fasting for 12 hours, those in the longer fasting group saw improvements in blood pressure, insulin sensitivity and beta-cell responsiveness.

Overall, I think that IF can be a tool for some people. In others, it might not be helpful at all, and in some it can be harmful. I like to discuss it in depth with my patients before they decide to give it a try. If someone wants to restrict the hours of eating, I think it’s important to let this work with the circadian rhythms, so stop eating hours before bed and fast longer during the night. I don’t suggest eating a large dinner and fasting all day.

Intermittent Fasting Calculator

Intermittent Fasting (IF) Calculator helps you cycling between Eating and Fasting: CLICK HERE

Jill Weisenberger’s comprehensive guide, ‘Prediabetes: A Complete Guide: Your Lifestyle Reset to Stop Prediabetes and Other Chronic Illnesses’ will lead you through dozens of concrete steps you can take to reduce the risk of developing type 2 diabetes and other lifestyle-related chronic diseases. Taking an individualized approach to your lifestyle “reset,” this book will allow you to choose your own path to wellness, help you gain a greater sense of wellbeing, boost your confidence in your abilities to maintain a healthful lifestyle, and potentially even help you reverse prediabetes and avoid type 2 diabetes and other chronic illnesses.

Diabetes Late Nite with music from Patti Austin

Jill Weisenberger appears on Divabetic’s Diabetes Late Nite podcast featuring music by Patti Austin. We’re talking to Jill about healthy strategies to help you deal with the “FOOD POLICE”.