A third of Britons believe they have changed social class, survey finds

‘Polyclass’ of 6 million people consider themselves to belong to more than one social category, researchers say

I made my husband ill with a few words – nobody is immune to the power of the nocebo effect

My prank demonstrated how our minds can adversely affect our health, and scientists are increasingly showing that negative thoughts can produce very real symptoms, says science writer Helen Pilcher

What are peptides, are they safe and is there evidence to back up the hype?

Influencers and athletes are among those claiming substances can help with injury repair, weight loss and angi-ageing

Medicines watchdog to investigate UK peptide clinics over health claims

Exclusive: Guardian investigation finds several clinics making potentially unlawful claims about benefits of unregulated therapies

‘Wild west’ reformer pilates boom is causing rise in injuries, experts warn

Lack of regulation for specialist classes leaves UK fitness enthusiasts at risk, say professional bodies

Department of Health retracts claim sunbeds are as dangerous as smoking

DHSC corrects statements after regulator intervenes as experts say smoking causes far more cancer cases

From trackers to gummies and CCTV, society has been gripped by sleep hysteria

We’re obsessing about sleep like never before. But much of the messaging is exaggerated, distorted and unhelpful, asks Royal Holloway Sleep Laboratory co-director Alice Gregory

Nicola Coughlan is right: ‘body positivity’ traps us in the same old conversations

The Bridgerton star has told of her horror at being approached by a fan who only wanted to talk about her body. Surely it’s time we focused on something else, says Guardian columnist Rhiannon Lucy Cosslett

Dissatisfaction with life in UK unchanged since Covid, official data shows

Average life satisfaction still below pre-pandemic peak despite improving economic outlook, reports ONS

What is the national maternity and neonatal investigation and why was it launched?

From racism to staff shortages, the interim report found a host of deep-rooted issues affecting women and babies