Its not about learning anything its about accepting reality.
People know eating crap, drinking coca cola and intaking sugar damages you but millions do it anyway and telling them otherwise gets you nowhere.
The economy is a mess, life is just existence and people have barely kept to the rules with thousanda dying a day - there is no way once everyone has had 2 doses and the death/hospital rates plummit will the population accept further restrictions on their lives/livelihoods its just not happening mate.
Even places like Australia who've done well have done so with certain restrictions- what happens if they want to host a world cup or rugby comp in future and have thousands coming in from overseas? Lockdown for 5 days soon as someone visiting comes down with a cough? Its unsustainable
A big part of the reason people eat and drink unhealthy things is because unhealthy things are specifically and expensively marketed to them, usually in unhealthy ways. This is a conscious decision by the firms involved, not something that’s always been.
I’m not sure the article mentioned earlier that pointed to the much greater level of obesity in the West has enough evidence behind it to say that about COVID yet, but the many other health risks caused by the supply of unhealthy food are well known.
There’s been some work to try and mitigate this, but it’s mostly for show (at least from government) and the trend (especially if the deal is signed with the US) has been more unhealthy, not less. There’s also not been much done to increase access to sport facilities that might help with an obesity crisis too (given how many have closed or had increases in cost, how few workplaces have a gym etc).
Which is sort of the point with this crisis - we’re repeatedly told people won’t live with restrictions, when the reality probably is the government aren’t going to actually do anything to deal with the known problems because it might cost some people money.