those are some great perspectives you show. You should consider posting some of them as actual arguments on the discussion rather than a comment. You can do that via https://debato.org . You say that prices are not a barrier to consumption, but why do you say that? Is it only from your perspective? Because there are plenty of studies showing the link between income and food quality ( one example: http://apjcn.nhri.org.tw/server/APJCN/18/4/598.pdf ). I completely agree with you when you say that price is not the only factor, at a certain level you will just buy the foods you like and prefer, if that is deemed unhealthy, that's their choice. And if you want to tackle this, raising awareness would indeed be the best option, But why do students, or other people with lower income go for a bag of chips, soda during dinner, or a drive-through on the way home? I believe because it is available, cheap and satisfies their immediate needs. removing one of these pillars, being cheap, I believe will influence the consumption already. A tax on unhealthy food is not ment to outlaw unhealthy eating, but to make alternatives more attractive for people who look to their wallet to determine what to eat.
But it is indeed valuable that you mention education and lifestyles as important factors as well.

I also like the argument of the cooking culture, that we are moving towards a culture that cooks less and eats less together. But I don't think the only other way for those lifestyles is with cheap microwave meals. There are plenty of alternatives with meal boxes you just have to throw together in a pan or food delivery services that are more diverse and accessible than ever. So also here I believe that increasing the price of unhealthy alternatives can steer this new lifestyle trend into one with healthy eating habits.

But consider posting your arguments on https://debato.org if you want to use the debating structure of the platform :D