High-GI Foods to Watch For (and What to Eat Instead)

A common worry when people first learn about the glycemic index is that they’ll have to give up half the foods they love. The good news: high-GI foods aren’t “banned.” The point of knowing them isn’t to live in fear of bread or potatoes — it’s that these foods raise your blood sugar fast, and once you can spot them, you get to choose. Swap them for a gentler version, balance them with the right partners on the plate, or just keep the portion sensible. That’s the whole game.

This guide walks through the high-GI foods that show up most often in everyday eating, grouped by category, with a concrete lower-GI swap for each one. New to the topic? Start with our plain-English explainer on what the glycemic index is, then come back here.

What makes a food high-GI

A food is considered high-GI when it scores 70 or above on the 0–100 glycemic index scale. That means it’s digested quickly and sends glucose into your bloodstream in a hurry, often followed by a dip that leaves you tired and reaching for a snack.

A few traits tend to push a food into the high band:

• Refined or processed. Milling strips away the bran and germ, so what’s left digests fast. White flour, white rice, and instant cereals are the classic culprits.
• Low in fiber. Fiber slows everything down. Take it out, and blood sugar climbs faster.
• Starchy, with little fat or protein to slow it. Potatoes and plain refined grains are mostly fast-acting starch.

One important caveat: GI isn’t the whole story, and portion size matters too. That’s what glycemic load (GL) measures — it combines a food’s GI with how much carbohydrate is actually in a realistic serving. Watermelon has a high GI of around 76, but a normal slice is mostly water, so its glycemic load is low and it barely nudges your blood sugar. Pairing also changes things: the same slice of bread hits more slowly with eggs and avocado than it does on its own. So treat the high-GI label as a prompt to think — not an automatic “never eat this.”

The table above lists common high-GI foods with their approximate GI, a rough glycemic load for a typical serving, and the band each falls into. Values are averages and will vary with brand, ripeness, and how a food is cooked. For a fuller reference, see our glycemic index chart of common foods.

Refined breads & baked goods

White bread sits around a GI of 75, a plain bagel near 72, and a French baguette can hit 95 — about as high as food gets. The problem is the same across the board: refined white flour with the fiber milled out, so it digests almost as fast as sugar. A bagel is a double hit, because a single one packs a large amount of carbohydrate into one sitting.

Swap to: sourdough, seeded whole-grain bread, or pumpernickel. Sourdough’s long fermentation produces acids that slow digestion and lower the GI of the loaf. Dense, seeded whole-grain and pumpernickel breads keep their fiber intact, so they release glucose far more gently than fluffy white bread. If you love a bagel, a smaller whole-grain one with cream cheese or nut butter softens the spike.

Breakfast cereals

Breakfast is where a lot of people unknowingly start the day on a blood-sugar rollercoaster. Cornflakes land around a GI of 81, puffed rice cereal near 87, and instant oats about 79. These are processed to be light and quick-cooking, which is exactly what makes them fast to digest. “Instant” oats are rolled thin and pre-cooked, so they behave very differently from the whole grain.

Swap to: rolled or steel-cut oats, or a natural muesli. Rolled and steel-cut oats keep more of their structure and fiber, putting them in the low-to-medium range, and they keep you full far longer. A muesli of oats, nuts, and seeds is gentler still. A spoonful of Greek yogurt or a handful of nuts on top adds protein and fat that flatten the curve further.

Potatoes & starchy sides

Potatoes are a sneaky source of fast carbs because they feel like a wholesome vegetable. A baked potato runs around a GI of 85, mashed potato about 83, and instant mashed potato near 87. They’re almost pure starch with little fiber to slow things down, and cooking them soft raises the GI even more.

Swap to: sweet potato, new potatoes cooked and cooled, or legumes. Sweet potato has a lower GI and brings more fiber and nutrients. With waxy new potatoes, there’s a neat trick: cooking them and then cooling them in the fridge turns some of the starch into resistant starch, which resists digestion and lowers the glycemic impact — even after a gentle reheat. Best of all, swap in beans, lentils, or chickpeas as your starchy side. They’re genuinely low-GI and loaded with fiber and protein.

White rice & refined grains

Sticky and jasmine white rice are among the highest-GI grains, with jasmine reaching about 89 and standard white rice around 73. The bran has been polished off, leaving fast-digesting starch. Because rice portions tend to be generous, the glycemic load adds up quickly.

Swap to: basmati rice, brown rice, quinoa, or barley. Basmati has a lower GI than other white rices thanks to its particular starch structure, so it’s an easy like-for-like switch. Brown rice keeps its fiber-rich bran. Quinoa and barley are lower-GI whole grains that bring extra protein and a chewy texture. As with potatoes, cooking rice and cooling it before reheating builds some resistant starch and trims the spike.

Sugary drinks & snacks

This category is the easiest to overlook and often the biggest offender. Regular soda sits around a GI of 63 — medium on paper, but borderline, and the real issue is that a can delivers a fast slug of sugar with zero fiber to slow it. Sports drinks are higher, near 78. Among snacks, pretzels (about 83) and plain rice cakes (about 82) are refined starch that digests almost instantly, and most candy spikes blood sugar fast. Dried dates, around 70, are naturally high-GI because they’re so concentrated in sugar.

Swap to: water, nuts, fresh fruit, or a square of dark chocolate. Water, unsweetened tea, or sparkling water with a slice of lemon replace sugary drinks without the spike. For snacks, a handful of nuts brings fat, fiber, and protein with almost no blood-sugar impact; whole fresh fruit gives you sweetness plus fiber; and a small piece of dark chocolate satisfies a sweet tooth with a far gentler response than candy.

You don’t have to cut them out

Notice that none of this is about banning your favorite foods. A few simple habits let you keep high-GI foods on the menu while keeping your blood sugar steady:

• Pair them with protein, fat, or fiber. Carbs almost never arrive alone in a real meal, and that’s a good thing. Bread with eggs, potatoes with a piece of fish, rice with beans and vegetables — each partner slows digestion and softens the spike.
• Mind the portion. A high-GI food in a small serving can have a modest glycemic load. The same food piled high is a different story. Reasonable portions keep both numbers in check.
• Cook and cool your starches. Potatoes, rice, and pasta cooked ahead and chilled develop resistant starch that lowers their glycemic impact, even after reheating. Batch-cooking does the work for you.

The takeaway is an encouraging one: you have real control. How you cook a food and what you put next to it can change the whole meal’s impact.

How FoodCheck GI helps

The honest catch with all of this is that you can’t see the glycemic index on a package. A nutrition label tells you carbs and sugars, but never the GI — and many packaged foods are higher-GI than they look, thanks to refined flours and hidden sugars baked in under names like maltodextrin, glucose syrup, or dextrose.

That’s exactly what FoodCheck GI is for. Scan a nutrition label, a barcode, or the food on your plate, and it instantly shows you whether something is high-GI before you put it in your cart — along with the glycemic load for that portion, any hidden sugars pushing the number up, and the full nutrition breakdown, all color-coded green, amber, or red in plain English. Instead of guessing at the shelf, you see the number that actually matters and can grab a lower-GI option on the spot.

Ready to build the other side of your plate? Browse the complete low-GI foods list for easy swaps you can start using today.