What is prediabetes?
Prediabetes means blood sugar is higher than normal but not yet in the diabetes range. It usually has no symptoms. In the US Diabetes Prevention Program, people who lost about 7% of their weight and exercised about 150 minutes a week cut their chance of getting type 2 diabetes by 58%. Many people return to normal blood sugar.
What "reverse" means here: improving the condition so your tests and symptoms get better (for type 2 diabetes, remission). Results vary from person to person, and your own doctor can tell you what's realistic for you.
Does Intermittent Fasting Reverse Prediabetes?
It can help. Any approach that leads to weight loss lowers the risk of diabetes, and intermittent fasting works about as well as ordinary calorie cutting in trials.
About intermittent fasting: Intermittent fasting means going without food for set periods, for example the 5:2 plan (two low-calorie days a week) or eating every other day. It mostly works by cutting calories overall, and in most trials it leads to about the same weight loss as ordinary calorie cutting.
Before you try it: Fasting isn't safe for everyone. Talk to your doctor first if you take insulin or other diabetes medicines (they can cause dangerous low blood sugar when you fast), are pregnant or breastfeeding, have had an eating disorder, or are under 18.
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Does the Keto Diet Reverse Prediabetes?
It can lower blood sugar, but it's usually more than people need. Prediabetes often improves with more moderate changes and losing around 7% of body weight.
About the ketogenic (keto) diet: A ketogenic diet is very low in carbohydrate, usually under 20 to 50 grams a day, so the body burns more fat and makes ketones. It lowers blood sugar quickly. It can raise LDL cholesterol in some people, and many find it hard to keep up for a long time.
Before you try it: Talk to your doctor first if you take diabetes medicines (insulin and some pills can cause low blood sugar, and SGLT2 medicines such as Jardiance or Farxiga can cause a rare but serious problem called ketoacidosis on keto), take blood pressure medicine, have kidney or liver disease, or are pregnant.
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Does a Low-Carb Diet Reverse Prediabetes?
It can help. Eating fewer refined carbs lowers blood sugar after meals, and weight loss from any diet lowers the chance of getting diabetes.
About a low-carb diet: A low-carb diet cuts back on sugar, bread, rice, pasta and other starches, usually to under about 130 grams of carbohydrate a day, without going as low as keto. The American Diabetes Association lists it as one of several healthy eating patterns for people with diabetes.
Before you try it: If you take insulin or other medicines that lower blood sugar, cutting carbs can cause low blood sugar. Ask your doctor whether your doses need to change before you start.
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Does Time-Restricted Eating Reverse Prediabetes?
Possibly. A small study of men with prediabetes found that eating within an early 6-hour window improved insulin sensitivity and blood pressure. Larger studies are needed.
About time-restricted eating: Time-restricted eating means eating all your food within a set window each day, such as 8 or 10 hours (16:8 is a common version). It's a type of intermittent fasting. Some people eat less without counting calories, but in larger trials it gave about the same results as simply eating fewer calories.
Before you try it: Talk to your doctor first if you take insulin or other diabetes medicines, are pregnant or breastfeeding, or have had an eating disorder.
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Does the Carnivore Diet Reverse Prediabetes?
Nobody knows yet. There are no trials of the carnivore diet for prediabetes. The proven approach, weight loss plus regular activity, is a safer first step.
About the carnivore diet: A carnivore diet means eating only animal foods: meat, fish, eggs and sometimes dairy, with no plants. Because it has almost no carbohydrate, it lowers blood sugar. But there are almost no clinical trials on it; most of what we know comes from personal stories and surveys. Doctors raise concerns about LDL cholesterol, the lack of fiber, and long-term effects nobody has studied.
Before you try it: Talk to your doctor first, especially if you have high cholesterol, heart disease, kidney disease or gout, or take diabetes medicines. Ask about checking your cholesterol after a few months.
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Sources
The main guidelines and studies behind this page. How we write our pages.
- Diabetes Prevention Program Research Group (Knowler et al.). Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. New England Journal of Medicine, 2002
- Evert et al. Nutrition therapy for adults with diabetes or prediabetes: a consensus report. Diabetes Care, 2019
- de Cabo & Mattson. Effects of intermittent fasting on health, aging, and disease. New England Journal of Medicine, 2019
- Liu et al. Calorie restriction with or without time-restricted eating in weight loss. New England Journal of Medicine, 2022
- Goldenberg et al. Low and very low carbohydrate diets for type 2 diabetes remission: systematic review and meta-analysis. BMJ, 2021
- Lennerz et al. Behavioral characteristics and self-reported health status among 2029 adults consuming a "carnivore diet". Current Developments in Nutrition, 2021
Written by DoctorsVideos.video as a general summary of published research, not by the doctors in the videos. For education only; it isn't medical advice. Talk to your own doctor before changing your diet or medicines. Last reviewed October 2026.