Everyone has their favourite mental comfort food, the stuff that makes you feel good in troubled times. Maybe you like baking bread and listening to history podcasts about Nazi atrocities. Maybe it’s watching Notting Hill in a Hugh Grant mask. Perhaps you love to unwind by sitting in your walnut-panelled library and reading Catullus, naked, covered in Doritos crumbs, with a plastic bag over your head. Or enjoy nothing better than doomscrolling in a state of late-night brain-death, before accidentally subscribing to a mystery supplement that will rid you of all the horrific writhing parasites inside your body, because the...