Take this as an example, my lunch break option 1: a cheese and ham pannini with tomatoes – £3.25 or option 2: a chip butty with BBQ sauce (btw BBQ sauce is much better than ketchup) £1.70
How were the chips cooked, your healthy option would also be dripping in fat from the cheese in it?
Items that are low in saturated fat, sugar, salt… that sort of thing – more comes into it, somebody else will have to give a more detailed criteria, remember this was just a thought.
how do you define low? some things may appear high but overall be lower than some others?
As above do you want to tax flour, milk, eggs, cheese and potatoes. They can be used to create some amazingly healthy/unhealthy meals??
In the end you should perhaps look at the type of place you shop, you are paying £3.25 for a cheese toastie with a fancy name. The chip shop is charging a fairer price.