Experts can’t agree how exactly they affect us and it’s not clear that science will give us an answer.
Entries by BBC News
Over-confidence, wasted opportunities and muddled-thinking left UK sleep-walking into Covid.
The Paralympic Rowing Cox will compete a year after getting the all clear from cancer.
One million more women would have life-saving checks if the NHS adopted self-testing, researchers estimate.
The Welsh government has made a number of proposals to restrict promotion of unhealthy food and drink.
A woman living with diabetes urges better communication over the supply of essential drugs.
Women who were in pain for years without answers want greater awareness around their condition.
Labour has launched an investigation into what's wrong with the NHS. Is productivity the place to start?
NHS chiefs say the injection form of the medicine can help save patients' and clinicians' time.
University of Oxford researchers start in-human vaccine trial to treat highly fatal Marburg virus.