Don't forget vegetarianism... this crap is often in mass media depicted as very positive for health. Sure, might work for some very very few individuals. Or against some certain health issues as a one time treatment, or such. But otherwise... seriously...
Humans will last longer than those cats did, because we have experience of thousands of years with cooked foods. But now there's all this... everything that's labeled as safe and normal that in reality is anything but. Have it all put on top of cooked foods and you end up worse than dead. I presume three or four more generations of this soup of crap and then it'll be here in full effect.
The best example of a collapse of civilization would the Mayan one. There are caves there that have pottery and such stuff in them that could only have gotten there if those caves weren't under water, and such times were about 15 000 years ago (wasn't the last ice age, or something similar, still going on that long ago?). As well there are very very many ruins of towns, averaging around 2 or 3 square kilometers, in the forests there, all thousands of years old. So what happened there? No one knows.
Considering the amount of towns the population must have been immense, far too high to be sustainable with their level of knowledge and society and civilization as a whole, the reason it all failed. Right now we are at a similar state - our global population is by about 4, even 5, billions too high, and our present knowledge that moves around in those masses, which in truth is made of almost only lies and delusions, cannot and will not sustain such numbers.
A collapse will, it has to, come again. A new beginning is needed. A dead end has been reached. Right now its just dragging on.
A course correction is needed if one is reached. Where is one? It's been years, decades even. All the while everything is getting worse. They say the people have the power, yet nothing is done against the rulers if they repeatedly make things worse. Because the people themselves don't know what to do, and those rulers come from the people - a dead circle before it began.
Negativity promotes thinking, justice, as well negative qualities but they don't tend to survive either way. This mess we are in makes many of us actually smarter - we see how matters must not be and we are far more prone to live by that which would be better. Those who are smart enough have to simply survive the collapse and then assume leadership, by whatever means necessary. Generations would be raised with newer and better values. Until it either reaches another end and collapse, or they will be smart enough to foresee it and course correct themselves.
Religion has been an extremely negative influence. Those who spoke out, in the past, the medieval and such times, were branded as heretics, witches, warlocks, and whatever else, just to remove them permanently. They were killed. Potential was killed on purpose, because they were right, they had the right. Religion still is a major issue everywhere, in regards to eventual consequences, because it has an extremely strong tendency to keep people very stupid and blind.
Dead ends. As an example, Soviet era reached one as well. It collapsed. Countries were "freed", they assumed new courses - true capitalism - sort of moved on for a while. But. They have reached yet another end. A new course correction is needed, but all they do instead is follow money even though it gets them absolutely nowhere. Because money has reached it's own dead end as well. A new course is needed already on that level, and the only one is one without.
The same goes about so many values, globally - dead ends - traditions, faiths, patriotism, nationalism, getting "paid" for a job, teaching to follow rules instead of teaching to think independently, etc.
Presently they all just drag onward toward nothing.
If a dead end is reached, anything that gives a direction, a nudge in any direction, is usually embraced with a broad smile. Because it's better than not moving at all. If only they put, if only they could, a little realistic thought into anything...
It will come. People will die, they would have to one way or another - there are far too many - things have gone too far already for "peaceful" and "ethical" alternatives.
Those who know and live and eat as a true human are inherently apt to better awareness. When shit hits the fan it's best to get out of the way and just let it happen, or it will blow you away with the rest.
Until then all you can really do is your best educating people about the state of our society, and what is really going on. Even create "groups" for better support and helping, make events where you talk to others, get public as best you can, etc. Most importantly teach what is food and what is not. And just hope, because there still is potential.