What are aspartame's health effects?

At typical consumption levels, most research finds no association between aspartame and cancer, although some studies suggest a slight increase in risk.

• Around 80%: A search of studies on whether aspartame causes cancer found about 80% said no, 13% said possibly, and 7% said yes. 1
• French cohort: In a cohort of roughly 100,000 people, low-to-moderate intake was associated with about a 15% higher relative risk of cancer; the reported increase was smaller—about 6%—among high consumers. The risk did not rise steadily with greater intake, so the association should be interpreted cautiously. 2
• Weight management: Aspartame-sweetened drinks may help with weight management when they replace sugar-sweetened drinks, by reducing calorie intake; the benefit depends on what they replace. 3

Overall, the discussion frames non-nutritive sweeteners as a possible practical tool, especially as a substitute for sugary drinks—not as a weight-loss remedy in themselves. 4