As well as increased choice and awareness of GI function, MANY foods today are 'fit for consumption' - BUT not good for most people. Me, its wheat flour - not alergic, but gives me migraine 'hangover' sort of feeling. Of course I avoid it. Before I knew, (2020 aged 51) I lived with this hangover, which put me in bed in a dark room several days a month. Tried giving up coffee, cheese, wine, chocolate, used lord knows how much painkillers - all pointlessly. Doctor told me it was hormonal. As soon as I knew wheat was one of the commonest sensitivities, I thought I'll try a week without - it was like walking into the sunshine. Never looked back. Can consume as much wine and choc as I fancy!