Not all sweet tastes are created equal. Here’s what the science says about how two common sugar categories affect your blood sugar response.
Key Points
- Artificial sweeteners and natural sugars are often used as healthier sugar swaps.
- Natural sugars will raise blood sugar levels, but artificial sweeteners don’t.
- Even though natural sugars impact blood sugar, they also have other important nutrients.
If there’s one topic that never seems to cool down in the nutrition world, it’s sugar. Research consistently supports guidance from major health organizations to limit added sugars due to their links to chronic disease and poor health outcomes. But, when it comes to other sweeteners, like artificial options and naturally occurring sugars, the conversation becomes more nuanced.
What sets them apart? The answer lies in their composition and how they affect blood sugar. Drew Hemler, M.Sc., RD, CDN, explains, “Natural sugars occur inherently in foods, such as fructose in fruit, and provide calories. Artificial sweeteners, on the other hand, are low- to no-calorie additives designed to provide sweetness without functioning as carbohydrate fuel.” He also notes an important distinction: while honey, maple syrup and agave are often perceived as “natural,” they still act as added sugars when used as sweeteners and can raise blood glucose. There’s more to the conversation than the origin of the sugar source.
Dustin Moore, Ph.D., RDechoes this perspective, adding that artificial sweeteners can sweeten foods and beverages with minimal calories, whereas natural sugars, typically derived from plants, provide about 16 calories per teaspoon.
So, how do these different types of sweetness actually influence blood sugar, and which has the greater impact? Here’s what the science says.
How Artificial Sweeteners Impact Blood Sugar
Low- and no-calorie sweeteners may come from plant sources or be produced synthetically in a lab. Regardless of their origin, they contribute few, if any, calories per serving. Their chemical structure is also very different from that of natural or added sugars. As Moore explains, this structural difference means the body does not metabolize most artificial sweeteners the same way it does carbohydrates.
A recent systematic review and meta-analysis found that beverages sweetened with nonnutritive sweeteners had metabolic effects similar to water, meaning they did not raise blood sugar on their own. It’s important to note that this research focused on calorie-free beverages. When these sweeteners are used in foods that also contain carbohydrates, sugar or other nutrients, the overall blood sugar response may differ.
Hemler adds that real-world effects can vary from person to person. “There may be indirect, individualized impacts through appetite, eating behaviors or gut microbiome pathways,” he notes. “Ultimately, the effect depends on the person, the type of sweetener and what the sugar is being replaced with in the overall diet.”
What Natural Sugars Do to Blood Sugar
Natural sugars are carbohydrates, which means they provide calories and have a very different chemical structure from artificial sweeteners. These sugars exist in several forms, like mono-, di- and polysaccharides, that the body breaks down into glucose for energy. A common example includes lactose, found in milk and dairy foods.
Because natural sugars are carbohydrates, they do raise blood sugar. After digestion, they’re absorbed into the bloodstream and trigger an insulin response. However, as Hemler emphasizes, food context matters. “The size and speed of a blood sugar rise depend on the type of sugar, the amount consumed and the form of the food.”
Research shows this principle in action. Whole foods that contain natural sugars, like fruit, also provide fiber, which helps slow digestion and blunt blood sugar spikes. As a result, high-fiber fruits generally have a lower glycemic index than lower-fiber options. Hemler notes that sugar in whole fruit behaves very differently from sugar in soda because fiber, protein and fat in mixed meals can slow absorption and improve fullness. In fact, a recent meta-analysis found that whole fruit consumption supports glucose management in people with type 2 diabetes, improving fasting blood sugar, hemoglobin A1C and cholesterol levels over time.
Which Impacts Blood Sugar More?
The simple answer: natural sugars. Moore writes, “Natural sugars from sucrose or fruits or starchy vegetables like corn and potatoes will naturally elevate blood sugars.” Remember, natural sugars contain calorie-containing sugars that are metabolized and as such impact blood sugar directly. This isn’t a bad thing; we need sugar to provide energy to keep our heart pumping and brain working. Plus, Hemler points out that in real life, a small amount of natural sugar can sometimes be a helpful bridge if it increases intake of nutrient-dense foods that people otherwise underconsume, such as lightly sweetened yogurt to improve calcium and protein intakes. “The goal is not no sweetness ever, but using sweetness strategically to improve overall diet quality while still staying within added sugar limits recommended in dietary guidance.”
At the same time, context matters. For those working to manage blood sugar, replacing a sugar-sweetened beverage with an artificially sweetened version can reduce post-meal glucose exposure and overall carbohydrate intake. Partnering with a registered dietitian can help you personalize these choices and find an approach that fits your health goals and daily routine.
Our Expert Take
Understanding how different types of sugar affect blood sugar can help guide smarter choices, especially for those with or at risk for conditions like diabetes. Natural sugars, such as the fructose in fruit, provide calories and energy, and do raise blood glucose, but the effect is moderated by food type and fiber content. Artificial sweeteners, by contrast, are low- or no-calorie and generally do not impact blood sugar directly. In both cases, overall diet quality, food combinations and lifestyle factors all play a role. As Hemler notes, “Blood sugar is important, but it’s only one part of metabolic health. Appetite regulation, insulin sensitivity, physical activity, sleep and overall dietary pattern matter too.”
By keeping these factors in mind, you can enjoy sweetness intentionally while supporting balanced blood sugar and overall health.
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