Michael Mosley finds out if eating carbs in the evening is bad for you, and tests whether beetroot can give your body and brain a boost. GP Zoe Williams investigates a condition that leaves millions of us with painfully cold fingers.

Deep in Alaska, the primal way lives on. Fight the freeze, brave the wild, hold on to your sanity. And winter is no wonderland when temperatures plummet far below zero. This series follows the drama and hardships experienced by Alaskan households in different corners of this merciless territory as they battle to survive, thrive, and live life on their own terms.