Sodium nitrite (E250) in processed meat: what the health data actually says
The curing salt behind ham, bacon and salami does a real job — and carries a real, well-documented concern. Here's what EFSA and the IARC concluded about E250 and processed meat.
Sodium nitrite — additive E250 — is a curing agent used in ham, bacon, salami, hot dogs and other processed meats. Unlike some additives, it does two genuinely important jobs, and it sits next to one of the best-documented dietary risk associations there is. Both halves matter.
What it does
- Prevents botulism. Nitrite suppresses Clostridium botulinum, the bacterium behind botulism — a real, potentially fatal food-safety function, not a cosmetic one.
- Colour and flavour. It's what keeps cured meat pink instead of grey, and contributes the characteristic cured taste.
The concern regulators actually flag
Under certain conditions — particularly high-temperature cooking — nitrites can contribute to the formation of nitrosamines, some of which are carcinogenic. Two official positions are worth knowing:
- EFSA reviewed nitrites in 2017 and confirmed an Acceptable Daily Intake, while noting that exposure to nitrosamines from the diet may be a concern — and that added nitrites contribute to that exposure.
- The IARC classifies processed meat as "carcinogenic to humans" (Group 1), based on colorectal-cancer evidence. This is a statement about processed meat as a food category — of which nitrite curing is a defining feature — not a claim that a trace of E250 in isolation causes cancer.
The practical takeaway most public-health bodies converge on: nitrite does a genuine safety job, and processed meat is a food category worth eating less of — the two facts coexist.
Seeing it in context
What matters isn't spotting E250 once — it's how often processed meat features in your week. Nitrite-cured products are typically NOVA Group 4 (ultra-processed), so they show up on more than one axis at once. Forkin flags the additive, the processing level and the environmental cost (red and processed meats tend to score poorly there too) from a single scan. Our guide to ultra-processed food explains the NOVA angle.