Clean eating, we are told, is the new path to a happy, healthy lifestyle. Constant dieting, the grim but essential lifestyle accessory of 1980s and 1990s celebrities, has been abandoned by the millennial generation in favour of the effortless perfection of a wellness-centred lifestyle. Dozens of shiny new healthy-food gurus fill the pages of our magazines, newspapers and airwaves telling us about their food philosophies, their natural glow and their journey to perfect health through diet. Their Instagram accounts document glamorous, aspirational lives centred round stylish kitchens, where these bright young stars perform assorted yoga moves next to an endless procession of avocado and quinoa-based delights.