theSIGNAL SCIENCE
16 August 2026
"The first step in solving a problem is recognising there is one."
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Science

A food preservative is now linked to rising UK suicides

Sodium nitrite, sold cheaply online and in bulk, is appearing in coroner reports at an alarming and accelerating rate across Britain.

Walk into almost any kitchen and you will find it — hidden in the pink blush of cured ham, lurking in a hot dog. Sodium nitrite keeps food safe. It also, a disturbing new study suggests, is quietly fuelling a rise in suicide deaths across the United Kingdom. Researchers analysed 164 confirmed poisoning cases submitted to the UK's primary postmortem nitrite-testing laboratory between March 2019 and August 2024.

The numbers tell a stark story. The average victim was just 28 years old. Nearly three-quarters of all cases involved members of Generation Z or Millennials, and 4% were under 18. Men and boys accounted for the large majority of cases — 109 male cases against a considerably smaller number of female ones.

Cases clustered most heavily in Greater London, South East England, and the Midlands, though the researchers warn that this pattern may simply reflect which coroners knew to test for nitrite, rather than where deaths are actually happening. What makes the findings especially unsettling is the timeline. The UK's overall suicide rate had been falling since the early 1990s. Then something shifted.

Photo: Braňo / Unsplash
Sodium nitrite is widely used in processed meats but is now linked to a surge in UK suicide cases.
Discuss
  • Why might young men be disproportionately represented in sodium nitrite poisoning cases?
  • Should governments restrict the online sale of chemicals that can cause harm, even if they have legitimate uses?
  • How much responsibility do food industry suppliers bear when their products are misused?
Science

Hawaii Braces for Rare Direct Hurricane Hit

Something extraordinary is happening over the Pacific. Hurricane Lala — spinning with winds near 130 km/h — is threatening to make direct landfall on Hawaii's Big Island, a scenario that hasn't occurred in 155 years. The numbers are startling. Up to 63 cm of rain could fall, nearly 37,000 homes have already lost power, and 80% of flights out of Hilo International were cancelled. Meteorologist Jennifer Myers watched the Wailuku River surge from her apartment window. The last hurricane to strike Big Island directly did so before the telephone was invented.…
  • Should residents of Pacific island nations be given more hurricane preparation resources?
∞
The findings point to an urgent public health need to reconsider unrestricted access to the chemical in an effort to prevent further avoidable deaths.
Researchers, BMJ Public Health study
Science

Same receptor, opposite drugs, same result

Here is a puzzle worth chewing on: two drugs target the exact same brain receptor — one switches it on, the other switches it off — and both cause weight loss. How is that possible? Researchers at the University of Cambridge have found the answer hiding in brain geography. Activating the GIPR receptor in the brainstem suppresses appetite, while blocking it in the hypothalamus triggers weight loss through an entirely different mechanism.…
  • If location changes a drug's effect, what else might brain geography explain?
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theSIGNAL IN THE LAB
1VOCABULARY
fuellingstark
unrestricted accessparallel surgesuppress
landfallmechanism
2GRAMMAR FOCUS
Inversion with negative adverbials
When a sentence begins with a negative or restrictive adverbial (e.g. 'Not only', 'Hardly', 'Never', 'No sooner'), the subject and auxiliary verb are inverted, as in a question. This structure adds emphasis and is common in formal writing.
had · did · was · were · only · sooner · never
  1. Not did sodium nitrite keep food safe — it also became linked to a rise in suicide deaths.
  2. Hardly researchers begun analysing the cases when they noticed a sharp rise after 2019.
  3. Never before regulators on every continent faced such pressure to restrict a common food additive.
  4. No sooner the hurricane strengthened than nearly 37,000 homes on the Big Island lost power.
  5. Not only the overall UK suicide rate falling before 2019, but it had been declining since the early 1990s.
  6. Hardly the Cambridge researchers published their findings when new questions about obesity treatment arose.
3DEPENDENT PREPOSITIONS
Complete each phrase with the correct preposition. All from today's articles.
  1. Cases clustered most heavily ___ Greater London.
  2. The chemical is linked ___ rising suicide deaths.
  3. Researchers warn that this pattern may simply reflect which coroners knew to test ___ nitrite.
  4. The laboratory first began receiving nitrite samples ___ 2019.
  5. Both drugs target the exact same brain receptor — one switches it on, the other switches it ___.
4CRITICAL THINKING
The sodium nitrite study notes that case numbers may reflect which coroners knew to test for the substance, rather than actual geographic patterns of deaths. What does this tell us about the relationship between scientific data and the systems used to collect it — and how should policymakers act when the evidence is acknowledged to be incomplete?
5CREATIVE · HEADLINES
Write a headline for the sodium nitrite story in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
The three articles each describe a situation where something widely available — a food additive, a weather pattern, a drug receptor — turns out to behave in an unexpected or dangerous way. Choose one and argue whether the surprise itself is the real problem, or whether the warning signs were always there to be seen.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • connected to→→
  • worried→→
  • available→→
  • notable→→
  • increased→→
  • unusual→→
8SPEAKING
  1. Could nitrite cases be under-counted in regions with less testing?
  2. What makes Hawaii's geography uniquely vulnerable to hurricane damage?
  3. Should obesity research challenge the idea that one drug fits all?
  4. How might bulk online purchasing rules be reformed without banning products?