A person with diabetes can eat a donut, but the type matters enormously. A standard glazed donut from a bakery has a glycemic index around 76, which is high enough to cause a sharp blood sugar spike. The better options are donuts made with low-carb flours, sugar substitutes, and added fiber, or simply smaller portions of traditional donuts paired strategically with protein or fat to blunt the glucose response.
The goal isn’t to find a donut that acts like it has zero carbs. It’s to find one that fits within a reasonable carbohydrate budget for a snack, which for most people with diabetes falls between 5 and 30 grams of carbohydrates.
Why Regular Donuts Hit So Hard
A typical fried glazed donut packs 200 to 300 calories, 15 to 20 grams of fat, and around 25 to 35 grams of carbohydrates, almost all from refined flour and sugar. That combination of refined carbs and deep-frying creates a food that digests fast, dumps glucose into your bloodstream quickly, and doesn’t keep you full for long. The glycemic index of 76 puts it in the “high” category, meaning it raises blood sugar nearly as fast as pure glucose.
That doesn’t make a regular donut permanently off-limits. But it does mean a whole glazed donut from your local shop, eaten alone on an empty stomach, is one of the least favorable ways to spend your carbohydrate budget.
Low-Carb Flour Swaps That Work
The single biggest change you can make is replacing white flour with a lower-carb alternative. Almond flour, coconut flour, and flaxseed meal all produce donuts with significantly fewer digestible carbohydrates. A homemade donut using almond flour as the base can come in under 5 grams of net carbs per serving, depending on the recipe, compared to 25 or more grams for a wheat flour donut.
Some commercial brands now sell keto-friendly donuts. Parlor Doughnuts, for example, lists 22 grams of total carbs but 12 grams of fiber per donut, bringing the net carb count down to around 10 grams. That’s a meaningful difference for blood sugar management, though you still need to check the label carefully. Not all “keto” donuts are created equal, and marketing claims can be misleading.
How To Read the Label
Net carbs are calculated by subtracting fiber and sugar alcohols from total carbohydrates. So a donut with 22 grams of total carbs, 12 grams of fiber, and some sugar alcohols could end up in the single digits for net carbs. But this math isn’t perfectly precise. The FDA doesn’t officially recognize “net carbs” as a regulated term, and different sugar alcohols affect blood sugar differently. Erythritol has virtually no glycemic impact, while maltitol (common in cheaper sugar-free products) can raise blood sugar about half as much as regular sugar. If maltitol is listed in the ingredients, count roughly half of those sugar alcohol grams as real carbs.
Choosing the Right Sweetener
Sugar is the other major driver of blood sugar spikes in donuts. Replacing it with a non-nutritive sweetener can cut carbohydrates dramatically without sacrificing much sweetness. The two best options for baking are monk fruit extract and erythritol, often sold as a blend.
Monk fruit sweetener doesn’t trigger an insulin response because your body doesn’t recognize its sweet compounds as sugar. Research in animals with type 2 diabetes has shown that monk fruit extract may actually help regulate blood sugar by slowing how quickly certain sugars are absorbed in the small intestine. Erythritol, a sugar alcohol, passes through the body largely undigested and contributes close to zero calories and zero glycemic impact. Both work well in donut recipes, though they can taste slightly different from sugar. Monk fruit blends tend to be the closest match in flavor.
The American Diabetes Association’s 2025 standards note that non-nutritive sweeteners can be used in place of sugar in moderation to reduce overall calorie and carbohydrate intake.
Baked Beats Fried
If you’re making donuts at home, baking them instead of frying cuts the fat roughly in half. A medium baked donut runs about 120 to 180 calories with 6 to 10 grams of fat, compared to 200 to 300 calories and 15 to 20 grams of fat for a fried one. Less fat means fewer total calories, but there’s also a blood sugar angle: deep-frying in certain oils can introduce trans fats, which worsen insulin resistance over time. A baked donut in a silicone mold gives you the shape and texture without the oil bath.
Add Fiber To Slow the Spike
Fiber is one of the most effective tools for flattening a blood sugar curve. Adding ground flaxseed or psyllium husk to donut batter increases fiber content without dramatically changing the taste or texture. Psyllium in particular has strong evidence behind it. A systematic review of randomized controlled trials found that psyllium significantly reduced both fasting blood sugar and post-meal glucose levels in people with type 2 diabetes. It works by slowing intestinal transit, which means glucose enters your bloodstream more gradually.
In practical terms, adding one to two tablespoons of ground flaxseed or a teaspoon of psyllium husk powder to a batch of donut batter can bump each donut’s fiber content by 2 to 4 grams. That doesn’t sound like much, but combined with almond flour (which already has more fiber than white flour), you can create a donut with 5 or more grams of fiber per serving.
Pair It With Protein or Fat
What you eat alongside a donut matters almost as much as the donut itself. Research on people with type 2 diabetes found that adding protein to a high-glycemic carbohydrate slightly reduced the blood sugar response, and adding both protein and fat reduced it significantly. In one study, the combination of 25 grams of protein and 25 grams of fat alongside a high-glycemic carbohydrate produced a substantially lower glucose spike than eating the carbohydrate alone.
This translates to a simple strategy: don’t eat a donut by itself. Have it with a handful of nuts, a slice of cheese, some Greek yogurt, or a hard-boiled egg. The protein and fat slow gastric emptying, meaning the carbohydrates from the donut reach your bloodstream more gradually. Even a glass of whole milk makes a difference compared to eating the donut with nothing else.
Timing Makes a Difference
If you’re going to eat a donut, morning is better than evening. A meta-analysis of acute postprandial studies found that the same meal eaten during the day produced a significantly lower blood sugar response than when eaten at night. Your body’s insulin sensitivity is naturally higher in the morning and declines as the day goes on. The difference isn’t trivial: the meta-analysis showed a large and statistically significant gap in glucose tolerance between daytime and nighttime eating.
So a donut with breakfast, paired with protein, is a meaningfully different metabolic event than the same donut eaten as a late-night snack.
A Practical Donut Formula
The most diabetes-friendly donut combines several of these strategies at once. Here’s what to look for, whether you’re buying or baking:
- Base flour: almond flour, coconut flour, or a blend with added flaxseed or psyllium husk
- Sweetener: monk fruit, erythritol, or a blend of both, not maltitol or regular sugar
- Cooking method: baked, not fried
- Net carbs: under 15 grams per donut, ideally under 10
- Fiber: at least 3 to 4 grams per serving
- Topping: a thin glaze made with powdered erythritol or a light dusting of cinnamon, rather than a sugar glaze or chocolate frosting
A donut built this way can come in at 5 to 10 grams of net carbs, well within the 5 to 30 gram snack range recommended for people with diabetes. Eaten in the morning alongside some protein, it’s a treat that fits comfortably into a blood sugar management plan without requiring you to give up something you enjoy.