Are Diet Drinks Really Healthier? What You Should Know About Aspartame
To cut sugar, many people turn to "sugar-free" and "zero-calorie" drinks. In July 2023, the International Agency for Research on Cancer (IARC), affiliated with the World Health Organization, classified aspartame as "possibly carcinogenic to humans, Group 2B," which briefly sparked concern. But what does this classification actually mean? Can we still drink sweeteners?
lightbulbKey takeaways
- ✓IARC's "Group 2B" reflects limited evidence, not a large hazard
- ✓Consumption within the acceptable daily intake (40 mg/kg) is considered safe
- ✓Sweeteners cut sugar and calories but provide no nutrition and shouldn't be overused long term
- ✓Plain water and light tea are the best everyday choices
What "Group 2B" really means
IARC's carcinogen classifications reflect "how certain the evidence is," not "how large the hazard is." Group 2B means existing evidence is limited and cannot confirm that it causes cancer in humans. The same category also includes many everyday items.
At the same time, the Joint Expert Committee (JECFA), which assesses intake risk, reaffirmed that aspartame's acceptable daily intake is 40 mg per kilogram of body weight, and consumption within this range is considered safe. Aspartame is about 200 times as sweet as sucrose, so reaching the limit would require a very large amount.
Sweeteners don't mean "drink as much as you like"
Diet drinks can reduce sugar and calorie intake, which helps somewhat with weight and blood-sugar control. But they provide no nutrition and may sustain a preference for sweetness, so heavy long-term consumption is not necessarily good for health.
The bigger concern is treating "sugar-free" as a health label and letting your guard down, ignoring your overall diet. The real solution is to gradually reduce reliance on sweet drinks, not to choose between two kinds of sweet drinks.
Smarter choices
Plain water and light tea are the safest everyday drinks. Occasionally replacing a sugary drink with a diet one is no cause for panic, but it should not become a heavy long-term staple.
Pregnant women, children and people with special conditions can consult a doctor or dietitian if in doubt. Paying attention to your overall diet and lifestyle is more meaningful than fixating on a single ingredient.
This article is for health education reference only and cannot replace professional medical diagnosis or treatment. If you feel unwell, please seek medical care promptly.