Plus, how to tell if it needs healing in the first place.

A trip to the loo used to fill Gagan Papneja with dread. 'I'd developed a phobia of going because I would regularly see blood, and I was scared I'd got cancer,' says Gagan, 45, who works in finance.

Background Gut bacteria have been implicated in a wide range of health conditions, yet their potential role in preventing and treating muscle-wasting disorders remains largely unexplored. Objective We ...