Both me & my wife have been known to do our weekly shopping which suddenly seems to consist of only naughty sugary diabetic foods from the sweetie isle & take only empty packets up to a very confused cashier (hypos suck).
Confusingly a rapidly falling blood sugar, but not actually hypoing seems to mean we just buy immense amounts of trash food we’d never normally buy.
As to the look of diabetics, most people still seem to confuse type 2 & type 1, so technically you had @megs had a complement as the person probably expected a diabetic to be 21 stone & eating a mars bar 