Common Food Preservative Sodium Nitrite Linked to Rising Suicide Deaths Among Young People

A study published in BMJ Public Health has identified a link between sodium nitrite, a common food preservative, and a rise in suicide deaths in the United Kingdom, Ireland, and Gibraltar, with young people and men disproportionately affected.

Researchers conducted a retrospective analysis of postmortem samples submitted to the primary UK laboratory responsible for assessing nitrite levels. The study examined 201 suspected cases of intentional or accidental poisoning reported between March 2019 and August 2024. After excluding cases without coroner approval, 164 cases were included in the final analysis.

The average age of the deceased was 28, with ages ranging from 14 to 82. Younger generations were significantly overrepresented: 71% of cases involved Millennials and Gen Z. Men accounted for 109 of the 164 cases. Blood testing in 87% of cases revealed nitrite and nitrate concentrations 100 times higher than physiological levels, which researchers interpreted as strong evidence of intentional ingestion.

The study identified two primary drivers for the increase. First, sodium nitrite is widely available as a food preservative and can be purchased without restriction. Second, the rise in its use as a suicide method coincides with the spread of online information providing instructions on how to acquire and ingest the chemical, often disguised as mental health support.

Researchers said their findings likely underestimate the actual number of cases because nitrite testing is not mandatory for all suspected suicides.

They are calling for urgent steps to restrict the unrestricted sale of sodium nitrite, tighter legislation to prevent harmful content from spreading on online forums, and the placement of antidote kits in ambulances as a cost-effective emergency intervention.