A ketogenic diet for prediabetes might include about 20 to 50 grams per day of non-fiber carbohydrates, or about 5 to 10% of total calories from carbohydrates. The rest of your calories come from fat and protein. The food choices on this diet are similar to those on other low-carb diets, but you may need to further restrict some of the moderate-carbohydrate options that might be easier to fit in on a more moderate low-carb diet. Examples include fruit (an apple has 24 grams of non-fiber carbohydrates) and starchy vegetables (a half-cup of corn has 15 grams of non-fiber carbs).
The advice above is therefore not only illogical, but also works poorly. It completely lacks scientific support according to a Swedish expert investigation. On the contrary, in recent years similar carbohydrate-rich dietary advice has been shown to increase the risk of getting diabetes and worsen blood sugar levels long-term in people who are already diabetic. The advice doesn’t improve diabetics’ health in any other way either.
Even if you have not been told that you have prediabetes, you could be worried about it, since 90% of the people with prediabetes are unaware that they have it. You are at higher risk if you are over 45 years old, do not get much exercise, have a family history of diabetes, or are African American, Native American, Hispanic/Latino, or Pacific Islander.