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American Focus > Blog > Tech and Science > Should You Be Worried About Aspartame? Here’s What The Research Says : ScienceAlert
Tech and Science

Should You Be Worried About Aspartame? Here’s What The Research Says : ScienceAlert

Last updated: May 7, 2025 6:55 am
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Should You Be Worried About Aspartame? Here’s What The Research Says : ScienceAlert
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The Controversy Surrounding Aspartame: A Comprehensive Analysis

Sugar – sweet, satisfying, and everywhere. From fresh fruit and honey to processed table sugar and drinks, it sneaks into nearly everything we eat.

While delicious, sugar delivers what nutritionists call “empty calories” – energy without any essential nutrients. And with overconsumption linked to obesity, type 2 diabetes, heart disease, and dental problems, it’s no wonder health authorities are urging us to cut back.

The World Health Organization (WHO) recommends limiting added sugar to less than 10% of daily calorie intake, while the BMJ suggests even lower: no more than six teaspoons (25g) per day for women and nine teaspoons (38g) for men.

In response, many people are turning to non-nutritive sweeteners – sugar alternatives that deliver sweetness without the calories. These include popular options like aspartame, sucralose, stevia, and monk fruit extract.

But not all that tastes sweet is sweet in effect. Let’s zoom in on one of the most controversial sugar substitutes: aspartame.

Aspartame is an artificial sweetener that was discovered in 1965 and is 180–200 times sweeter than sugar. It was first regulated by the US Food and Drug Administration (FDA) in 1974 and approved for use in dry foods in 1981.

Today, it’s estimated to be found in over 6,000 food and drink products and 600 pharmaceutical items.

Aspartame was initially embraced as a tool to help reduce obesity and support diabetics, offering a sweet fix without the sugar spike. But despite decades of use, its safety is still the subject of intense scientific and public debate.

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Cup of tea with sweetener
Many people are turning to non-nutritive sweeteners – sugar alternatives that deliver sweetness without the calories. (Photosiber/Canva)

Potential benefits

Aspartame has a similar taste to sugar, albeit much more intense, but comes with almost no calories, making it attractive for those who’re weight-conscious. With obesity rates soaring globally, even small calorie savings can matter.

Aspartame does not raise blood glucose levels, making it a preferred choice for those managing type 2 diabetes.

However, other research has found potential associations with metabolic syndrome and diabetes risk, suggesting that aspartame should be used as part of a controlled diet rather than a straight swap for sugar.

While assessments suggest that aspartame is safe within current intake guidelines, concerns persist.

Potential risks

Some people may experience side-effects like headaches, dizziness, or mood changes. There’s emerging evidence linking aspartame to neurodegeneration, strokes, and even dementia.

Aspartame can increase levels of phenylalanine and aspartic acid in the brain, which is a serious concern for people with phenylketonuria (PKU), a rare inherited disorder where the body cannot break down phenylalanine.

This causes it to accumulate in the blood and brain, potentially leading to brain damage. People with PKU must avoid aspartame completely.

One study reported symptoms after consuming aspartame including irritability, migraines, anxiety, and insomnia, especially with excessive consumption.

In 2023, the International Agency for Research on Cancer (IARC) classified aspartame as “possibly carcinogenic”, though it remains approved for consumption within existing safety limits. Some studies suggest a link to cancer, but conclusions remain mixed.

It’s also advised that pregnant women avoid aspartame, as research suggests it may affect the placenta’s structure and function.

Artificial sweeteners, despite being calorie-free, may trick the brain into craving more sweetness. This could lead to increased appetite and weight gain rather than weight loss. In fact, several studies have found a positive correlation between artificial sweetener use and obesity.

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Gut health matters

Emerging evidence suggests that aspartame and other sweeteners may disrupt the gut microbiome, the community of bacteria that play a key role in digestion, immunity, and even mood.

This disruption can negatively affect digestive health and immune function, potentially increasing the risk of infections and other health issues.

Aspartame may offer a tempting sugar-free fix, but it’s not without its risks. The World Health Organization advises against using non-sugar sweeteners for weight control and research continues to reveal complex links between aspartame and chronic diseases, from neurological issues to gut health concerns.

Hazel Flight, Programme Lead Nutrition and Health, Edge Hill University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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