The frosting is the tell. A coffee cupcake can look like a modest pick-me-up, yet the added sugar in its cake, filling, or glaze gives it a metabolic aftertaste that caffeine cannot cancel. You taste comfort. Your proteins may get the bill.This is not skin-care scaremongering. When excess glucose circulates, it can bind nonenzymatically to proteins in a reaction called glycation; through further c...More