Why do we sleep? To clean our brains, say US scientists

Cerebral spinal fluid found to pump around the brain of sleeping mice, flushing out waste products like a biological dishwasher

Tom Hanks has type 2 diabetes

Actor reveals he has condition on Late Night with Letterman, but says his disease is 'controllable'

Obamacare is a lifesaver. Sign me up

Sadhbh Walshe: Until now, I've had to trust tofu and yoga will keep me healthy. The ACA is a game-changer for millions of Americans like me

US employers slashing worker hours to avoid Obamacare insurance mandate

Trend sparks fears among low-paid workers that they will be hit twice: by having earnings cut and paying more for healthcare

Obamacare: stop listening to the partisan hacks

Heather Long: Most Americans are unsure about Obamacare, and that's OK. Here are five key areas to help people make up their own minds

Republican senator Ted Cruz launches marathon anti-Obamacare speech

Not able to delay proceedings with a formal filibuster, Cruz began speaking out against Obama's healthcare reforms

Republican Ted Cruz blames Democrats for looming government shutdown

Cruz tried to reverse responsibility for the latest budget stand-off in hopes of garnering support from moderate Republicans

Anti-Obamacare ad is not only tone-deaf and creepy – it’s also harmful

Tom McCarthy: Video aimed at getting US college students to opt out of healthcare reforms – without realising they're already rejecting it

Smoothies and fruit juices are a new risk to health, US scientists warn

Scientists say potential damage from naturally occurring fructose in apparently healthy drinks is being overlooked

Turning back the clock: how to stop (or slow) signs of ageing – live chat

Emma G Keller: Lauren Kessler spent a year investigating the ageing process and what – if anything – we can do to prevent it. She'll take your questions live today at 1pm ET