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In a trial, some participants were asked to reduce their calorie intake by 25 per cent every day. After two years, they showed signs of slowed biological ageing in one test, but not in others

Health

Does restricting calories slow down ageing? We simply don't know

A test based on blood biomarkers suggests that calorie restriction slightly slows ageing, but the jury is out on whether the dieting strategy really works

Analysis

Countries such as the UK, Mexico and South Africa have a tax on sugary drinks

Health

Taxing sugary drinks may not cut obesity as much as headlines claim

Analysis

The respiratory syncytial virus (RSV) usually causes mild, cold-like symptoms, but can be severe in vulnerable people

Health

The first ever vaccine against RSV could be approved in 2023

Analysis

Observational studies suggest that puzzles may ward off dementia, but this has not been proven

Health

Lifestyle may affect your dementia risk but the extent is exaggerated

Analysis

Environment

The first breach of 1.5°C will be a temporary but devastating failure

Analysis

Screen with ChatGPT chat with AI or artificial intelligence. Man search for information using artificial intelligence chatbot

Technology

Should schools ban ChatGPT or embrace the technology instead?

Analysis

Close up of Burning gas cooker

Health

Gas stoves harm our health and the climate - should they be banned?

Analysis

People waiting outside a clinic in Beijing

Health

How is China ending its zero-covid policy affecting cases and deaths?

Analysis

Madison Thomson a forester with The Conservation Fund measure a Redwood tree in the Big River Forest near Fort Bragg, California

Environment

California's carbon offsetting may actually be increasing emissions

Analysis

Eve Bazaiba Masudi, Vice-Prime Minister and Environment Minister of the Democratic Republic of Congo and Brazil Foreign Minister Leonardo Cleaver de Athayde, left, and Daniel Tumpal Sumurung Simanjuntak of Indonesia raises their arms following a discussion at the COP15 UN conference on biodiversity in Montreal

Environment

COP15: Treaty may unravel over last-minute disputes and vague targets

A landmark biodiversity agreement was hammered out at the COP15 biodiversity summit over objections from some countries, but it may not live up to lofty expectations

Analysis

Health

Strep A kills 500,000 people a year, so why isn’t there a vaccine?

Analysis

Health

We’re rushing the use of psychedelics as medicine, researchers say

Analysis

Technology

Why you may never be able to buy your own self-driving car

Analysis

Health

China's failure to vaccinate makes giving up on zero covid a huge risk

Analysis