6 healthy foods that could secretly spike your blood sugar, and what to eat instead

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  Food and Wine on Thu, Oct 09th, 2025 by Fox News

Six “Healthy” Foods That Can Sneakily Spike Your Blood Sugar (And What to Eat Instead)
Fox News, October 2024

When you think of a food that’s “good for you,” the first thing that comes to mind is usually a nutrient‑dense fruit, a hearty grain, or a lean protein. But as the latest Fox News article reveals, even some of the most celebrated staples can trigger a sudden rise in blood glucose if you’re not careful about portion size, preparation, and what you pair them with. The piece, “6 Healthy Foods That Could Secretly Spike Your Blood Sugar, Here’s What to Eat Instead,” pulls together data from the American Diabetes Association, Harvard Health Publishing, and the University of Texas at Austin to help readers make smarter, steadier choices.

1. Sweet Potatoes

Why the Spike?
Sweet potatoes are often lauded for their beta‑carotene, fiber, and vitamin A content. Yet their glycemic index (GI) can climb as high as 70—on par with or even higher than regular white potatoes—because the natural sugars inside are released rapidly when cooked to a smooth, mashed texture. The article cites a study from the University of Texas that found a standard baked sweet potato (about 150 g) caused a 30‑minute post‑meal glucose rise comparable to a bagel.

Swap Suggestion
Opt for roasted sweet potato wedges with the skin on, or keep the portion to a 1‑inch cube. Pair it with a protein‑rich side (such as grilled salmon or a lentil salad) and healthy fats (like avocado or a sprinkle of olive oil). This combination slows digestion and lowers the overall glycemic response.

2. Whole‑Wheat Bread

Why the Spike?
Whole‑wheat bread is a go‑to source of complex carbohydrates, but the article points out that many commercially available varieties are fortified with added sugars and contain refined flour that raises their GI to around 70–80. A single slice can push blood glucose levels significantly higher, especially if you’re prone to insulin resistance.

Swap Suggestion
Choose sprouted grain bread or a rye loaf with a lower GI, or better still, ditch bread entirely for a lettuce wrap or cauliflower “tortillas.” If you must use bread, spread a thin layer of natural peanut butter or low‑fat cheese to add protein and fats that temper the rise.

3. Oatmeal

Why the Spike?
Despite its reputation as a heart‑healthy food, plain rolled oats can produce a noticeable glucose surge because the oats’ starches are quickly broken down during cooking. The article references a Harvard study that shows overnight oats soaked in liquid can have a GI of 66–70, depending on added sweeteners.

Swap Suggestion
Use steel‑cut oats, which take longer to chew and digest, resulting in a GI of 55. Add ground cinnamon, nuts, or chia seeds for extra fiber and healthy fats. Keep portions to ½ cup cooked, and avoid sweetened mixes or adding fruit juices that can boost the sugar load.

4. Milk (Whole or Low‑fat)

Why the Spike?
Milk contains lactose, a natural sugar that can cause a modest rise in blood sugar, especially for those who are lactose intolerant or have impaired insulin sensitivity. The article notes that a standard 8‑oz glass of milk can add 9–12 g of sugar, which is not negligible if consumed frequently.

Swap Suggestion
Replace dairy milk with unsweetened almond, soy, or oat milk—all of which have a much lower carbohydrate content. If you need calcium, opt for fortified versions. Pair the milk substitute with a protein powder or a handful of nuts to keep you full.

5. Fruit‑based Granola Bars

Why the Spike?
Granola bars marketed as “healthy” often contain added honey, agave syrup, or dried fruit, making their sugar content surprisingly high. The article points out that a single bar can contain as much sugar as a sugary candy bar, leading to a sudden glucose spike.

Swap Suggestion
Make your own trail mix with raw nuts, unsweetened coconut flakes, and a small amount of dried berries (or skip the dried fruit entirely). If you need a convenience snack, choose bars with no added sugars and a higher protein content, such as those containing whey or pea protein.

6. Apple Juice (or Other “Healthy” Fruit Juices)

Why the Spike?
Fruit juices, even those labeled 100 % juice, lack the fiber that slows sugar absorption. Apple juice, in particular, has a GI of about 61–70. Consuming 8 oz of juice can deliver 21 g of sugar in a single sitting.

Swap Suggestion
Replace fruit juice with whole fruit—the fiber helps to buffer the glucose response. Alternatively, dilute apple juice with water or mix it into a smoothie that contains protein (e.g., Greek yogurt) and healthy fats (e.g., flaxseed) to reduce the glycemic load.

How These Foods Fit Into the Bigger Picture

The article frames the “blood sugar spike” narrative as more than just a simple nutrition tip. It highlights that chronic, frequent spikes can contribute to insulin resistance, pre‑diabetes, and ultimately type 2 diabetes. For individuals already managing blood sugar, these foods become especially problematic. Even for healthy people, keeping glycemic peaks under control can help with weight management, sustained energy levels, and overall metabolic health.

The piece also acknowledges that no single food is inherently “bad.” Context matters. Pairing a high‑GI food with protein, fiber, or healthy fats dramatically dampens the glucose response. The American Diabetes Association’s guidelines, cited in the article, emphasize a balanced plate: half of the plate filled with non‑starchy vegetables, a quarter with lean protein, and a quarter with whole grains or starchy vegetables—but always mindful of portion size.

Key Takeaways for Readers

Bottom Line

The article’s overarching message is simple yet powerful: “Healthy” doesn’t automatically mean “stable.” Even foods that are nutrient‑rich can sabotage your blood sugar if consumed in the wrong way. By swapping or pairing certain staples with protein and fiber, you can enjoy the benefits of these foods while keeping your glucose levels in check. For anyone concerned about blood sugar, especially those with pre‑diabetes or type 2 diabetes, the Fox News guide offers a practical roadmap to tweak everyday meals and snack choices. And if you want to dig deeper, the links embedded in the article—such as to the American Diabetes Association’s educational pages, Harvard Health’s glycemic index database, and the University of Texas’s research on carbohydrate digestion—provide evidence‑backed explanations that reinforce the advice.

In a world where convenience foods are increasingly marketed as healthy, this piece reminds us that the context, portion, and combination of foods are just as important as the ingredients themselves.