Revealed: many common omega-3 fish oil supplements are ‘rancid’

Independent tests find that a number of products on the market use oxidised oils, with the rancidity often masked by flavourings

Global heating linked to early birth and damage to babies’ health, scientists find

Exclusive: Impacts include premature births and birth defects and affect everybody, everywhere, say researchers

Has gen Z really killed off dieting – or has it just changed its name?

Body positivity is all the rage and soft drinks are being repackaged as ‘zero sugar’. But is ‘clean eating’ just dieting in disguise, asks Arwa Mahdawi

South Korea should fund hair loss treatment, says election hopeful in bald bid for power

Proposal for hair regrowth on public healthcare insurance by Lee Jae-myung criticised as populist by opponents

Five great reads: what drives burnout, the reality of revenge porn and four years filming a cow

Guardian Australia’s summertime round-up of juicy writing as selected by lifestyle editor Alyx Gorman

Five great reads: a cyclist battles bad driving, interactive self-help and a deeply weird symposium

Guardian Australia’s bespoke round-up of upbeat and occasionally infantile summertime reading, as selected by Alyx Gorman

Phil Harvey obituary

Social entrepreneur who used profits from sex shops to subsidise contraception in developing world and to champion civil liberties

The person who got me through 2021: Ami Faku sang the break-up track I listened to on a loop

I’ve spent 12 months of the pandemic obsessively listening to the song Uwrongo, with its line: “This is not working, go home.” I’m very grateful to its singer

Walking is a glorious, primal pastime – and far more radical than you think

Despite its reputation as a bourgeois hobby, walking has been a lifeline for millions past and present, says Guardian columnist John Harris

Taking my kids out of school has taught me the joy of staying in and doing nothing

I was conditioned to think of going out as morally superior to hibernating. Now I regard the decisive opt-out as a dynamic choice too, says Guardian columnist Emma Brockes