10 Unexpected Foods that Spike Blood Sugar

Do you know which foods can lead to significant spikes in blood sugar levels?

Olivia Johnson
6 min readFeb 13, 2024

Numerous advertisements and news reports often highlight certain foods as beneficial for managing blood sugar levels, but in reality, some of these may have the opposite effect. Even seemingly nutritious options can lead to significant spikes in blood sugar levels, making them less suitable for individuals managing diabetes. Let’s explore the prevalent factors contributing to this scenario.

1. Brown Rice

Boasting higher fiber content compared to its white counterpart, brown rice offers a wholesome alternative. However, it’s essential to be mindful of its carbohydrate content, with over 40 grams per cup that swiftly converts into glucose, potentially causing blood sugar spikes. For those closely monitoring carb intake, it’s noteworthy that a mere 1/3 cup of rice equals one carbohydrate exchange, equivalent to 15 grams of carbs. Managing portion sizes is key to preventing unwanted blood sugar fluctuations. If you’re looking to further reduce your carb consumption, consider exploring veggie alternatives such as cauliflower rice for a delicious and nutritious twist!

2. Fruit Juice

For generations, the promotion of fruit juice has echoed its status as a wholesome elixir, a drink mirroring the nutritional benefits of consuming the whole fruit. However, it’s crucial to recognize that a single fresh orange delivers a wealth of fiber, carbohydrates, and essential vitamins, containing around 15 grams of carbohydrates. In contrast, a mere cup of fruit juice lacks the same fiber and nutrients while presenting a significant carbohydrate load of 45 grams. Opting for fresh or frozen fruits is recommended, especially for those managing blood sugar levels, unless addressing a low blood sugar episode.

3. Oatmeal

When it comes to choosing your morning fuel, delving into the world of packaged oatmeal and hot cereals unveils a hidden challenge — added sugars. Careful scrutiny of labels is paramount to making a health-conscious decision. Even if you opt for the traditional stove-cooked whole oats, managing your portion size becomes a pivotal factor in preventing significant spikes in blood sugar levels.

Oats boast a protein-packed profile and serve as an excellent source of dietary fiber, elevating their nutritional appeal. However, it’s crucial to note that a single cup of oatmeal harbors 27 grams of carbohydrates (prior to any sweetener additions). Crafting a strategic breakfast plan is essential for maintaining optimal control over your overall carbohydrate intake.

4. Sweet Potatoes

Have you ever stumbled upon claims touting sweet potatoes as a blood sugar-friendly food? It’s time to reconsider the reliability of such sources. While sweet potatoes boast a rich array of vitamins and a fair amount of fiber, their carbohydrate content is notable, akin to that of white potatoes. While sweet potatoes are indeed a commendable choice for wholesome carbohydrates, it’s crucial not to fall prey to inaccurately researched assertions. It’s imperative to acknowledge that all potatoes, including sweet ones, contain substantial starchy carbohydrates, often exceeding 30 grams per serving, which could potentially elevate blood sugar levels when consumed in large quantities.

5. Bran-Raisin Cereal

In the realm of breakfast cereals, bran-raisin emerges as a nutritional powerhouse. However, despite its wholesome reputation, bran-raisin cereal often harbors hidden pitfalls, particularly in the form of excessive sugar and processed carbohydrates. Surprisingly, a mere cup of this seemingly virtuous cereal can pack over 40 grams of carbs and a staggering 18 grams of sugar, surpassing the sugar content found in beloved favorites like Captain Crunch and Fruity Pebbles! Regrettably, the majority of boxed cereals, including reputed brands like Kashi, undergo such extensive processing that they trigger blood sugar spikes far beyond what their carbohydrate content would suggest.

6. Dehydrated Fruits

When pondering the perceived health benefits of choosing raisins over chocolate chips for managing blood sugar, a closer examination reveals a surprising truth. A mere half-ounce comparison between raisins and chocolate chips shows an additional gram of carbohydrates in the former. While raisins stand as a more wholesome carbohydrate source, they still exert an impact on blood sugar levels. Interestingly, the rapid blood sugar elevation induced by raisins makes them an effective remedy for addressing low blood sugar situations. This characteristic extends to other dehydrated fruits such as apricots, mangoes, cranberries, and more.

7. Whole-grain bread and pasta

Similar to the benefits of brown rice, opting for whole-grain varieties of bread and pasta could provide additional fiber and potentially more vitamins. However, it’s crucial to be aware that these products still contain processed carbohydrates, leading to a rapid increase in blood sugar levels. Some may even use molasses for coloring, creating a brown appearance to give the illusion of wholesomeness. When selecting your whole-grain bread, scrutinize the extensive list of ingredients; a lengthier list often indicates a product that may not be as beneficial for your health.

8. Cow’s milk

While the dairy industry promotes cow’s milk as a healthy dietary choice, there are alternative beverages that provide calcium without the added sugar. A standard 8-ounce glass of cow’s milk packs 12 grams of carbs in the form of lactose (dairy sugar). Opting for unsweetened milk alternatives such as almond, flax, and soy not only delivers the creamy taste you crave but also offers a mere 3 grams of carbs while providing abundant calcium. If you’re aiming to reduce carb intake and manage blood sugar levels, consider skipping cow’s milk in favor of these low-carb alternatives.

9. Yogurt

Indulge in the goodness of probiotics with yogurt, a renowned supporter of gut health. However, the modern yogurt market is flooded with heavily processed options, potentially diluting the benefits of beneficial bacteria. Beware of hidden sugars, as even seemingly wholesome yogurt brands can contain up to 30 grams of sugar. Take a closer look at the ingredients list and select your yogurt brand judiciously. Surprisingly, some yogurts rival ice cream in sugar content, albeit with less fat, making them a marginally healthier choice for those seeking a dessert alternative!

10. Bananas and Grapes

While all fruits naturally contain fructose (sugar), the glycemic impact varies significantly. Opting for a small bowl of berries with a low glycemic index may result in minimal fluctuations in blood sugar levels. However, bananas and grapes stand out for delivering a substantial carbohydrate load. For individuals managing diabetes, a banana can pose more challenges to blood sugar levels than a small serving of ice cream. Grapes, often referred to as ‘sugar bombs’ by many diabetics, have the potential to rapidly elevate blood sugar even with just a small intake.

The Bottom Line

Understanding the unexpected foods that can spike blood sugar levels is crucial for managing overall health, especially for individuals with diabetes or those aiming to maintain stable blood sugar levels. While some foods may seem innocent or even healthy, their impact on blood glucose can be significant. By being aware of these unexpected culprits and making informed dietary choices, individuals can better regulate their blood sugar levels and promote overall well-being. Remember to prioritize balanced meals, monitor portion sizes

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