How Eating Oatmeal at Breakfast Can Affect Your Blood Sugar

Having oatmeal in the morning can be a nutritious way to start the day, but its impact on blood sugar depends on the oats you choose and the ingredients you add. Here’s a look at how oatmeal affects blood sugar and how to make it a better option for glucose control.

Less Processed Oats Tend to Be Better for Blood Sugar

Oatmeal is rich in carbohydrates. As your body breaks down oats, those carbs turn into glucose and enter the bloodstream, which raises blood sugar. Still, the size of that rise depends on the type of oatmeal you eat.

“Less processed varieties, like steel-cut oats, are digested slowly, causing a more gradual rise in blood sugar levels,” Rachael Ajmera, MS, RD, dietitian, writer, and founder of Nutrimental, told HEALTH.

Studies indicate that minimally processed oats, such as steel-cut oats, trigger a much smaller rise in blood sugar and insulin after eating than more processed options like rolled or instant oats, which are digested more quickly.

What you mix into your bowl matters too. Sweeteners such as sugar, maple syrup, or jam increase the total carb load and add fast-digesting carbohydrates that can cause blood sugar to climb more quickly.

Understanding Oatmeal’s Glycemic Index

The glycemic index (GI) is a scale from 0 to 100 that ranks carbohydrate-containing foods by how quickly they raise blood sugar. Foods with a score of 70 or higher are considered high GI and have a greater effect on blood sugar, while low-GI foods, which score 55 or below, cause a slower and smaller increase.

For blood sugar management, lower-GI oats, such as steel-cut oats, are the best choice.

Nutrition in Oatmeal

Here’s how a 40-gram serving of common oat types compares nutritionally:

The nutritional differences between steel-cut and rolled oats are small. Even so, steel-cut oats take longer to digest because of the way they are processed, which makes them the better option for blood sugar control.

Instant oats are often higher in calories and carbs, and lower in protein and fiber, which makes them the least nutritious choice.

Can People With Diabetes Eat Oatmeal?

If you have diabetes, you may have heard that carbohydrate intake should be limited, especially processed carbs like instant oats. Even so, you do not need to cut out healthy carbohydrate sources entirely.

“The less processed oatmeals, such as steel-cut, can reduce your post-meal blood glucose and your insulin response,” Stacy Heimburger, MD, board-certified internist, lifestyle medicine physician, and founder of SugarFreeMD, told HEALTH. That is because these oats take longer for your body to break down, leading to a slower and steadier increase in blood sugar.

Oats also contain beta-glucan, a soluble fiber that helps keep blood sugar steadier by slowing how quickly glucose enters the bloodstream and creating a more gradual rise after meals.

It is also important to pay attention to serving size and toppings. Even a healthy base like oatmeal can become less beneficial if portions are too large or if you add ingredients that raise the carb content too much.

Ways to Make Oatmeal More Blood-Sugar Friendly

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