Ever been to a grocery store that has your email address on file? (Some stores with the reward card systems have that logged).
I’d think it’d be a nice idea to offer an opt-in service that will email you something that gives you an idea of what’s there in your groceries, nutritionally. eg: Buy some oatmeal, get nutritional suggestions that include things like honey or sugar being added to oatmeal, or fruit being added, stuff like this.
It’d have to be opt-in, since people whine about this otherwise, but it would go a long way to put things like this in people’s faces.