A Common Food Preservative Is Implicated in Rising UK Suicide Deaths Among Young People

A BMJ Public Health analysis of 2019–24 data links the food preservative sodium nitrite to a rise in suicide deaths across the UK, Ireland and Gibraltar. 71% of cases involved Gen Z and Millennials, men outnumbered women 109 to 52, and the average age was 28. Researchers are calling for tighter regulation of the chemical and action against harmful online information.

Key Takeaways

A BMJ Public Health analysis of 2019–24 data links the food preservative sodium nitrite to a rise in suicide deaths across the UK, Ireland and Gibraltar.
71% of cases involved Gen Z and Millennials, men outnumbered women 109 to 52, and the average age was 28.
Researchers are calling for tighter regulation of the chemical and action against harmful online information.

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A chemical found in many processed foods is emerging as a disturbing factor in rising UK suicide deaths, particularly among young people and men. The analysis of 2019–24 data, published in BMJ Public Health, suggests the true scale may even be underestimated.

Researchers led by Professor Amrita Ahluwalia examined cases submitted to the country's primary laboratory for postmortem nitrite and nitrate testing by coroners, forensic pathologists and police forces across the UK, Ireland and Gibraltar. Between March 2019 and August 2024, 274 samples arrived from 201 suspected deliberate or accidental poisonings; 164 coroner-approved cases were used for the final analysis.

The numbers are stark. The average age was 28, and 71% of cases involved younger generations — Gen Z accounted for 33% and Millennials 38%. Men outnumbered women by more than two to one, with 109 male cases versus 52 female. In 87% of cases, blood levels of nitrite and nitrate were more than 100 times higher than physiologically expected — strong evidence that ingestion was intentional.

'Collectively, these findings establish unequivocally that use of sodium nitrite in the UK as a method of suicide is both substantial and concerning,' the authors write. They point to freely accessible online information detailing how sodium nitrite can be obtained and used — circulated both under the guise of mental-health support and for explicitly harmful purposes.

The team calls for urgent action: tighter regulation of access to the chemical, measures against harmful online material, and simple emergency responses such as providing an antidote (methylthioninium chloride) kit in ambulances — 'a simple and cost-effective, timely method to prevent the devastating consequences of ingestion.'