Quick Answer: In 2023, the WHO's cancer research agency (IARC) classified aspartame as "possibly carcinogenic to humans" (Group 2B). However, the FDA, EFSA, and WHO's food safety committee maintain it is safe at current consumption levels. The debate continues.
Aspartame is the world's most widely used artificial sweetener, found in over 6,000 products including Diet Coke, Crystal Light, sugar-free gum, and many "zero sugar" products. It's approximately 200 times sweeter than sugar. In July 2023, IARC classified aspartame as "possibly carcinogenic" based on limited evidence linking it to liver cancer in some studies. However, the Joint WHO/FAO Expert Committee on Food Additives (JECFA) simultaneously reaffirmed its acceptable daily intake of 40mg/kg body weight. For a 150-pound adult, that's equivalent to 9-14 cans of diet soda per day. Critics argue the studies showing harm used unrealistic doses, while proponents of caution note that long-term low-dose exposure studies are limited.
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Diet Coke, Diet Pepsi, Crystal Light, sugar-free Jello, Equal sweetener, many sugar-free gums, and thousands of "zero sugar" products contain aspartame.
Stevia and monk fruit are generally considered the safest non-caloric sweeteners, as they are plant-derived with fewer long-term safety concerns than synthetic alternatives.
CheckIt AI. (2026). "Is Aspartame Safe? — CheckIt AI". Climaverse PBC. Retrieved from https://getcheck.it/answers/is-aspartame-safe"Is Aspartame Safe? — CheckIt AI." CheckIt AI, Climaverse PBC, 2026-03-05. https://getcheck.it/answers/is-aspartame-safe.<a href="https://getcheck.it/answers/is-aspartame-safe">Is Aspartame Safe? — CheckIt AI — CheckIt AI</a>@misc{checkit2026answersisaspartamesafe,
title = {Is Aspartame Safe? — CheckIt AI},
author = {CheckIt AI},
year = {2026},
publisher = {Climaverse PBC},
url = {https://getcheck.it/answers/is-aspartame-safe},
note = {Retrieved 2026-03-05}
}