7 non-sweet foods that cause blood sugar to spike

Non-sweet foods that cause blood sugar spikes

Eating a lot of white rice may increase the risk of blood sugar spikes. Photo:

When it comes to foods that cause blood sugar spikes, many people only think of candies or sweets. However, many non-sweet foods can also raise blood sugar quickly—sometimes even more sharply than refined sugar.

The key lies in the Glycemic Index (GI), which reflects how quickly a food raises blood glucose levels. Foods rich in refined starches or easily digestible carbohydrates typically have a high GI and cause blood sugar spikes.

White rice

According to India Times, rice is an essential ingredient in every meal, but if you want to include it in your diet, you need to ensure you are eating the right type of rice. According to Harvard Medical School, white rice is so heavily processed that its nutritional value is equivalent to eating "pure table sugar." That is not good for anyone's health—especially for people living with diabetes.

This food is particularly concerning for pregnant women. During pregnancy, the body easily experiences reduced insulin sensitivity; thus, just a single bowl of white rice can cause blood sugar to rise faster than usual, increasing the risk of gestational diabetes and affecting fetal development.

For young children, consuming large amounts of refined carbohydrates lacking accompanying fiber and protein can cause blood sugar to spike quickly and then drop sharply, leading to rapid hunger, frequent snacking, and in the long run, an increased risk of overweight.

Refined grains

Similar to white rice, white bread or noodles made from refined flour have virtually no sweet taste, yet they are leading culprits behind blood sugar spikes. This food group has a high GI, causing blood glucose to rise rapidly after eating.

In addition, research from Stanford University shows that many people experience sharp spikes in blood sugar after eating this food, even if they are healthy. This is likely due to refined carbohydrates being rapidly broken down into glucose.

The American Diabetes Association (ADA) recommends replacing them with whole grains. Not only do foods like barley, whole-grain bread, and whole-wheat pasta provide fiber, minerals, and essential vitamins such as B and E, but they are also low glycemic index (low GI) foods. Low GI foods are digested more slowly and are less likely to cause sudden spikes in blood sugar levels.

Instant noodles, breakfast cereals, and processed foods

Processed foods such as instant noodles, crackers, and savory snacks are usually not sweet, yet they still raise blood sugar. These foods contain refined carbohydrates and easily digestible starches that cause blood sugar to spike just like sweets. Furthermore, they may contain "hidden sugars" and very little fiber.

Many breakfast cereals do not taste overly sweet but have a high GI. Nutritionists warn that processed cereals and commercial breads can easily spike blood sugar levels because they undergo heavy refining.

According to the UK National Health Service (NHS), consuming large amounts of these processed foods during pregnancy not only causes blood sugar fluctuations but also provides little essential nutrition for the fetus. Meanwhile, young children who eat too much of them are prone to nutritional deficiencies and are likely to develop a taste preference for ultra-processed foods.

Making the wrong food choices can cause blood sugar spikes, which is harmful to people with diabetes. Photo: Freepik.

Potatoes (especially fried or mashed)

Potatoes are not sweet, but they can spike blood sugar very quickly. According to Verywell Health, potatoes have a high GI, especially fried or mashed potatoes, causing a sharp spike in blood sugar after meals.

French fries are particularly popular with young children. However, eating too many potatoes in finely mashed or fried form can lead to rapid absorption by the body, making excess calorie intake and starch-heavy eating habits more likely. This increases metabolic disturbances, contributing to the risk of obesity and blood sugar problems in the future.

Fruit juice (unsweetened), plant milk

According to Hindustan Times, while it sounds healthy, fruit juice is actually one of the foods that spike blood sugar the fastest. Juicing removes fiber—the factor that helps slow sugar absorption—so the body absorbs glucose very quickly. Therefore, even juice with no added sugar can cause a sharp spike in blood sugar.

Some plant-based milks, especially oat milk, can cause rapid spikes in blood sugar. This is because the starch in oats is processed into an easily digestible form, which quickly converts into blood glucose.

Canned food

Canned foods often contain excess sodium and preservatives. Many cans are lined with bisphenol A (BPA), a chemical linked to endocrine disruption. Exposure to BPA can negatively affect insulin sensitivity and increase cardiovascular risk in people with diabetes.

High-salt foods

Foods such as pickles, cured meat, and salted fish contain very high levels of sodium. Consuming too much salt raises blood pressure and increases blood glucose levels; long-term consumption elevates the risk of developing diabetes. Therefore, everyone should keep their daily salt intake under control.