Are we a nation of hypochondriacs? Majority of people wasting NHS resources on allergy tests they DON’T need, experts say Roughly 12 per cent of the adult population believe they have a food aversion – when, in reality, only 1 to 2 per cent actually do. The latter, although only comprising of four questions, offered a 90 per cent accuracy in detection and could subsequently help save the NHS huge sums.