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  • Nearly half of United States adults consume artificial sweeteners.
  • Human-population studies have found artificial sweeteners to be safe, but results from in vitro studies and studies on animals pose some concerns.
  • A large new study of artificial-sweetener consumers finds that the products are associated with an increased risk of cancer.

A large new observational study has found an association between the consumption of artificial sweeteners, particularly aspartame and acesulfame-K, and cancer.

The study found a 13% higher risk of cancer in general, with the highest likelihood of developing breast cancer and cancers related to obesity, for people consuming large quantities of artificial sweeteners.

The worldwide artificial sweetener market is estimated at $22.2 billion and rising, a nearly three-billion-dollar increase in the last 2 years alone. A 2017 study found that 41.4% of U.S. adults and 25.1% of children use artificial sweeteners, ingredients in a wide array of commercial products.

Referring to them as “high intensity sweeteners, colchicine tablet picture ” the U.S. Food and Drug Administration (FDA) has approved six such substances as being safe for human consumption at typical daily intake levels.

Many respected medical authorities and organizations today consider artificial sweeteners safe after extensive epidemiological research with human populations.

Dr. Philip Landrigan was not involved in the study. He is director of the Global Public Health Program and Global Pollution Observatory, and Professor of Biology at Schiller Institute for Integrated Science and Society of Boston College, MA. He shared with Medical News Today why the new study is so important:

“There is strong evidence of carcinogenicity of aspartame from animal studies, but no solid epidemiological confirmation until now. For this reason, this study is very important and has large implications for public health.”

– Dr. Landrigan

“Especially of concern to me as a pediatrician,” he noted, is the fact that “in animal studies, even very low doses of aspartame in the diet of a pregnant female rat are powerfully carcinogenic in her offspring.”

The new research is published in PLOS MEDICINE.

About the study

The study was authored by researchers associated with the Nutritional Epidemiology Research Team (EREN) of Sorbonne Paris Nord University’s French Institute for Health and Medical Research (INSERM), the Conservatoire National des Arts et Métiers (CNAM), and the National Research Institute for Agriculture, Food, and Environment (INRAE) in France.

The researchers analyzed the histories of 102,865 adults participating in the ongoing NutriNet-Santé study that began collecting data in 2009. Participants were followed for the new research over an average of 7.8 years.

“Findings from this study are very original since, to our knowledge, no previous cohort study had directly investigated the association between quantitative artificial sweetener intakes per se, from all dietary sources — distinguishing the different types of sweeteners — and cancer risk,” lead author and Ph.D. candidate Charlotte Debras told MNT.

The reason for the study, said Debras, was:

“Some observational studies have previously investigated the associations between cancer risk and the consumption of artificially sweetened beverages (used as a proxy) and found an increased risk of cancer, suggesting that artificial sweeteners present in these types of beverages might play a role in the development of cancer. In addition, previous findings in animal models and in vitro / in vivo studies also suggested their carcinogenicity.”

Aspartame and acesulfame-K

Senior investigator and director of EREN Dr. Mathilde Touvier said to MNT:

“We performed analyses for the ‘total of artificial sweeteners’ overall (i.e., the sum of acesulfame-K, aspartame, sucralose, cyclamates, saccharin, steviol glycosides, and salt of aspartame-acesulfame), and then separately for the most represented artificial sweeteners in the cohort (i.e., acesulfame-K, aspartame, and sucralose).”

Looking deeper into the greater risk of Aspartame and acesulfame-K, Dr. Touvier explained, “It should be noted that aspartame and acesulfame-K were by far the most frequently consumed artificial sweeteners.”

She added:

“Thus, the fact that associations were observed for these two — and not for sucralose for instance — should be considered with caution since it may only be due to the fact that aspartame and acesulfame-K were the most commonly consumed. So maybe the statistical power was not sufficient to detect associations for sucralose, and definitely, the number of consumers of other sweeteners did not allow us to investigate them as such, so no conclusion could be drawn for them.”

Drawing conclusions

“On the basis of this study only,” said Debras, “it is not possible to establish the causality of the association — this will need replication in other studies in other countries and settings — and it is not possible to set up a ‘dose at which the risk appears,’ if any.”

Debras, however, noted, “What we can say is that, in this study, higher consumers of artificial sweeteners, above the median intake of 18 mg/d and for which average intake was 79.43 mg/d, had a significantly increased cancer risk compared to non-consumers.”

Dr. Touvier added:

“Residual confounding cannot be entirely ruled out. However, the models were adjusted for a wide range of potential confounding variables, including dietary exposures (i.e., baseline intakes of energy, alcohol, sodium, saturated fatty acids, fiber, sugar, whole-grain foods, and dairy products) enabling [us] to limit confounding bias.”

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