A new year and for many a new commitment to shift those extra pounds. But how much of weight gain is down to bad habits, and how much is down to more unalterable factors, like your age? Luke explores the science of weight gain, and specifically how age affects your fat cells, and also looks at why gut microbiomes could be at the root of many of our cravings.

Listen and subscribe to Show Me the Science on Apple Podcasts ,Google Podcasts and Spotify.

Download, listen and subscribe on the Newstalk App.

You can also listen to Newstalk live on newstalk.com or on Alexa, by adding the Newstalk skill and asking: 'Alexa, play Newstalk'.