Let’s break down what the researchers found.
Reviewed by Dietitian Madeline Peck, RDN, CDN
Key Points
- Cutting back on sweet foods doesn’t reduce your preference for sweetness, a new study suggests.
- Sweet taste exposure didn’t impact calorie intake, weight, or health markers in healthy adults.
- Sustainable weight management may rely more on portion control and balanced meals than avoiding sweetness.
Many humans naturally love the taste of something sweet, partly due to our genetics. Because of this built-in preference, public health organizations often advise us to cut back on sweet-tasting foods, in part because of the negative health effects associated with overconsumption of sugar. The logic is that if you eat fewer sweet foods, you will lose your taste for them. According to this narrative, lowering your preference for sweetness will naturally decrease your sugar intake, thus cutting down your daily calories and helping prevent obesity.
But when we look closely at the science behind this advice, a surprising gap appears. Empirical data supporting the idea that avoiding sweet foods changes your taste preferences is actually a bit lacking. A recent large-scale study published in the American Journal of Clinical Nutrition set out to test this exact theory, and the results challenge much of the standard public health advice.
How Was the Study Conducted?
To understand how sweet taste exposure affects our preferences, researchers conducted a randomized controlled trial. They recruited 180 healthy adults and split them into three distinct groups for a six-month dietary intervention. The researchers designed the diets to expose the groups to different levels of sweet-tasting foods:
- Low sweet taste exposure: Only 7% of the provided foods and beverages were sweet.
- Regular sweet taste exposure: About 35% of the provided foods and beverages were sweet.
- High sweet taste exposure: About 80% of the provided foods and beverages were sweet.
For six months, the researchers provided the participants with about 50% of their daily energy needs to ensure they complied with their assigned sweet exposure levels. The provided foods included items sweetened with sugar, low-calorie sweeteners and natural sources like fruit.
Throughout the six-month intervention and a subsequent four-month follow-up period, the research team tracked several key metrics. They carefully measured how much the participants liked sweet tastes, their perception of sweet taste intensity, their overall energy intake and their body weight. They also tracked markers for cardiovascular disease and diabetes to see how the different diets affected overall health.
What Did the Study Find?
The participants consumed different amounts of sweet foods based on their assigned groups. During the six months, the low-exposure group consumed about 14.3% of their total energy from sweet foods, representing a decrease from their normal habits. The regular-exposure group maintained their normal intake at about 20.7% of their energy. The high-exposure group increased their intake, getting about 27% of their total energy from sweet foods.
Despite these clear differences in daily diets, the main findings showed that, from the start of the study to the six-month mark, researchers found no significant differences between the groups when it came to their liking for sweet foods.
Whether participants ate a diet rich in sweet foods or a diet mostly free of them, their actual preference for sweetness remained stable. Furthermore, the researchers found no significant differences between the groups regarding:
- Sweet taste intensity perception
- Sweet food choice during an unmonitored breakfast meal
- Overall daily energy intake
- Body weight or body fat percentage
- Health markers for diabetes and cardiovascular disease
Interestingly, after the six-month intervention ended, participants spontaneously returned to their baseline levels of sweet food intake. Those who had been restricted went back to eating more, and those who were overexposed naturally cut back.
Limitations of the Study
While this study provides valuable insights, we must consider its limitations. First, the participant pool was relatively healthy, predominantly female and highly educated. These characteristics might influence how closely people followed the dietary advice and how their bodies responded.
Additionally, the actual differences in sweet taste exposure between the groups ended up being somewhat modest. The high-exposure group reached 27% of their energy from sweet foods, which fell short of the researchers’ original target of 40% to 45%. A more extreme difference in diets might have produced different results. It’s also worth noting that this study included only adults. It’s possible that childhood exposure to sweet foods has an effect on your sweet tooth, and further research may be able to illuminate such a connection.
How Does This Apply to Real Life?
These findings have major implications for real-life dietary advice and public health recommendations. For years, agencies have told people to avoid sweet-tasting foods (even those made with low-calorie sweeteners) under the assumption that tasting sweetness could encourage an insatiable sweet tooth.
This study suggests that this specific piece of advice may be missing the mark. For adults, strictly reducing sweet taste exposure does not seem to change how much they like sweet things. It also does not automatically lead to eating fewer calories or losing weight.
If your goal is to reduce the risk of obesity or manage your weight, simply trying to aggressively eliminate sweet flavors from your diet might be an exercise in frustration. Instead, we need to look at other proven methods. Strategies like managing portion sizes, reducing the overall energy density of your meals and limiting drinks packed with empty calories may be much more likely to help you achieve your health goals than simply fighting your natural preference for sweet flavors.
And if you love having something sweet for dessert—or even as a midday snack—consider mixing in lower-sugar options that still satisfy. Options like yogurt bark, refreshing ice cream and yummy fruit bars can be great additions to your weekly menu. Here are a few of our favorites:
Our Expert Take
A randomized controlled trial published in the American Journal of Clinical Nutrition provides compelling evidence that our preference for sweet tastes is remarkably stable in adulthood. The researchers found that changing the amount of sweet food you eat does not rewire your brain to dislike sweetness—or like it more than you already do. More importantly, differing levels of sweet taste exposure did not drive changes in total energy intake or body weight.
While this study adds valuable information to our understanding of sweet taste preferences, it represents only one piece of a much larger puzzle. The findings suggest that, at least for healthy adults, reducing or increasing sweet taste exposure may not have the expected impact on sweet preference or energy intake. More research, including studies with different populations, age groups, and longer-term follow-up, is needed to fully understand the effects of sweet taste exposure on health.
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