Is Aspartame bad for you?
Also listed as: INS 951, E951, contains phenylalanine
Short answer
Food safety experts still consider aspartame safe within the acceptable daily intake, although a WHO cancer agency labelled it ‘possibly carcinogenic’ in 2023 based on limited evidence. People with PKU must avoid it.
What it is
A low-calorie sweetener made from two amino acids, about 200 times sweeter than sugar.
Where you’ll see it
Diet colas, sugar-free gum, some ‘lite’ yoghurts and tabletop sweeteners.
+ The good side
- Almost no calories
- Doesn’t raise blood sugar directly
− The other side
- IARC classed it as ‘possibly carcinogenic’ (Group 2B) in 2023 on limited evidence; JECFA kept the existing safe-intake level
- Contains phenylalanine, dangerous for people with phenylketonuria (PKU)
- WHO advises against non-sugar sweeteners for weight control
Who should pay attention
People with PKU (must avoid), and heavy diet-drink drinkers.
💡 What to do: If you drink several diet sodas a day, cutting back is a reasonable precaution.
Got a pack with Aspartame?
Snap the label. NutriSathi shows how much it matters in that product, for your body and where you bought it. Free.
Check a product free →Related
Sucralose
Approved as safe at normal intakes and adds no calories, but the WHO advises against relying on non-sugar sweeteners for weight control.
Stevia (steviol glycosides)
A plant-derived, zero-calorie sweetener approved as safe. It is a reasonable sugar swap, though the WHO guidance on not using sweeteners for weight control still applies.
General food information, not medical advice. Exact limits and labelling rules vary by country. If you have a medical condition or allergy, follow your doctor’s or dietitian’s advice.