If they're serious about improving health, they need to add/increase VAT on "bad" foods such as those with little nutritional benefit and those high in sugars/fats/carbs, etc.
I.e. remove the VAT zero rating on "unhealthy" ultra processed foods, remove zero rating on crisps, biscuits, packets of breakfast cereal, etc. Just maintain zero rating on unprocessed foods such as basic meat, veg, fruit, dairy, etc.
Increase the VAT rate from 20% to maybe 25/30% on takeaways, fast food, pies, pasties, chips, etc, sugary drinks, etc.
Never happen of course - just think of all the sad faces that would be all over Facebook and the media! Osborne tried a relatively minor change on VATable status of pasties and pies (a la Greggs etc) and got absolutely slaughtered by the media forcing a U-Turn!
A double win - more tax revenue and also maybe a nudge for people to eat more healthily meaning less future strain on the NHS! What's not to like??