Most whole foods contain at least some fructose alongside glucose, but several food groups deliver glucose with little to no fructose at all. Dairy products, plain starches like white rice and potatoes, and certain sweeteners like dextrose are the clearest examples. If you’re managing fructose malabsorption or hereditary fructose intolerance, these categories form the backbone of a safe diet.
Why These Two Sugars Matter
Glucose and fructose are both simple sugars, but your body handles them very differently. Every cell in your body can use glucose directly for energy, and your pancreas releases insulin to manage it. Fructose, on the other hand, is processed almost entirely in the liver through a separate pathway involving a specific enzyme called ketohexokinase. Research from the National Institute of Diabetes and Digestive and Kidney Diseases has shown that fructose consumption is linked to more fat accumulation in the liver and worse metabolic outcomes than equivalent amounts of glucose, particularly in the context of a high-fat diet.
For people with fructose malabsorption or hereditary fructose intolerance (HFI), the distinction isn’t just academic. Unabsorbed fructose ferments in the gut, causing bloating, pain, and diarrhea. In HFI, fructose can cause dangerous drops in blood sugar and liver damage. Knowing which foods are genuinely fructose-free, rather than just “low sugar,” is essential.
Dairy: The Cleanest Source of Glucose Without Fructose
Plain milk, yogurt, and other unsweetened dairy products are among the best foods for getting glucose without any fructose. The sugar in dairy is lactose, and when your body digests it, lactose breaks down into roughly 47% glucose and 53% galactose. No fructose is involved at any point. This makes plain milk, plain yogurt, cottage cheese, and hard cheeses safe choices.
The key word is “plain.” Flavored yogurts, chocolate milk, and sweetened dairy drinks often contain added sucrose or high-fructose corn syrup, both of which deliver significant fructose. Stick with unsweetened versions and add your own glucose-based sweetener if needed.
Starches That Break Down Into Pure Glucose
Starchy foods are your best friends when avoiding fructose. When you eat starch, your digestive enzymes break it into glucose molecules, and fructose never enters the picture. The most reliable options include:
- White rice and brown rice: pure starch with no appreciable free fructose
- Potatoes: mostly starch, with only trace amounts of free sugars
- Plain pasta: made from wheat flour and water, the carbohydrate is essentially all starch
- Oats and unsweetened cereals: cooked or ready-to-eat, as long as they aren’t sweetened or sugar-coated
Clinical dietary guidelines for hereditary fructose intolerance specifically list pasta, rice, plain breads, soda crackers, and saltines as safe staples, provided they’re made without added sucrose, fructose, or sorbitol. Sorbitol matters because your body converts it into fructose during digestion.
Bread Is More Complicated Than You’d Expect
Plain white or wheat bread made from flour, water, yeast, and salt is generally very low in fructose, since yeast consumes most free sugars during fermentation. However, the picture isn’t perfectly clean. Research published in Food Chemistry: X found that fructose was actually the dominant free sugar in sourdough bread samples, with glucose levels lower because yeast and bacteria preferentially consume glucose during fermentation, leaving fructose behind.
That said, the absolute amounts of free fructose in plain bread are still small, typically in the range of a few milligrams per gram. The bigger risk is commercial bread with added sugar, honey, or high-fructose corn syrup in the ingredient list. If you’re strictly avoiding fructose, read labels carefully or bake your own with just flour, water, yeast, and salt.
Vegetables With Very Low Fructose
Most vegetables contain modest amounts of both glucose and fructose, but several have so little free fructose that they’re considered safe even for people with fructose intolerance. According to data from Alberta Health Services, these vegetables stand out for having essentially zero or near-zero free fructose per serving:
- Sweet onion: 0 g free fructose per half cup
- Green peppers: 0 g free fructose per cup (sliced)
- Cucumber: 0.1 g free fructose per cup (sliced)
- Tomato: 0.2 g free fructose per medium tomato
- Asparagus: 0.4 g free fructose per six spears
Leafy greens like spinach, lettuce, and chard are also very low in all sugars, making them safe choices. The vegetables to be cautious about are the sweeter ones: sugar snap peas, sweet corn (which contains some free fructose), and especially cooked beets and carrots in large quantities.
Sweeteners That Are Pure Glucose
If you need to sweeten food or drinks, a few commercial products deliver glucose without any fructose. Dextrose is simply another name for glucose. You can buy dextrose powder (sometimes labeled “dextrose monohydrate”) online or at brewing supply stores. It tastes about 70% as sweet as table sugar, so you may need a bit more to get the sweetness you want.
Maltose, found in malt syrup and some rice syrups, is a sugar made of two glucose molecules bonded together. Your body breaks it into pure glucose. Maltodextrin, a common food additive, is a chain of glucose molecules and also fructose-free. Clinical guidelines for HFI list glucose, dextrose, dextrin, and maltose as approved sweeteners alongside zero-calorie options like stevia and aspartame.
Be cautious with products labeled “corn syrup.” Regular corn syrup is mostly glucose and is relatively low in fructose, but high-fructose corn syrup (HFCS) is a completely different product that contains 42% to 55% fructose. Always check the specific ingredient name.
Foods to Avoid or Limit
Table sugar (sucrose) is 50% glucose and 50% fructose, so it’s off the list entirely. Honey is roughly 40% fructose. Agave nectar can be up to 90% fructose. Fruit is the trickiest category because most fruits contain significant free fructose. Apples, pears, mangoes, and watermelon are particularly high. Even fruits perceived as tart, like grapes, carry substantial fructose.
Sorbitol, a sugar alcohol found naturally in stone fruits and used as an artificial sweetener, converts to fructose in your body. Products labeled “sugar-free” that use sorbitol can still cause problems for fructose-sensitive individuals. Other sugar alcohols like erythritol and mannitol do not convert to fructose and are generally tolerated.
Putting a Low-Fructose Plate Together
A practical meal built around glucose without fructose looks something like this: grilled chicken or fish (protein has no relevant sugars), white rice or plain pasta, sautéed asparagus and green peppers, and a glass of plain milk. For seasoning, garlic, cinnamon, salt, pepper, and poppy seeds are all fructose-free. Pure peanut butter without added sugars works as a snack or spread.
The pattern is straightforward: build meals around protein, plain starches, low-fructose vegetables, and unsweetened dairy. Use dextrose or maltose-based sweeteners when you need something sweet. Read ingredient labels for hidden sucrose, honey, fruit juice concentrates, and sorbitol, all of which deliver fructose under names that don’t always make it obvious.