The thing barely touched on is that taxation of consumables (amongst other things) discriminates unfairly against the poor.
Where there are people on Income Support who can barely cover the cost of rent and heating then something has to be cut. If meat is too expensive (remember good quality protein is the only essential macro nutrient) then cheap stomach fillers will be eaten instead.
There is a good reason that there is no VAT on food.
However there now seems to be creeping taxation "for our own good".
Sugar tax, meat tax, fat tax? Where will it end?
Allegedly, though, these taxes will be trivial compared to the import duty we will have to pay on vegetables should we end up in the future with unfavourable tax agreements. I think we import around 70% of our vegetables (figures vary depending on where you look).
A meat tax won't stop me eating meat, or even reduce my consumption. It may well impact the diet and health of the 25% of the population with the least disposable income, though. Who are often the same demographic who aren't capable of cooking their own meals from scratch due to lack of time, lack of knowledge or lack of facilities.
There is a good reason why chains like MacDonalds are still thriving. They provide basic (not saying healthy) meals for very little cost.