Low-meat and meat-free diets associated with lower overall cancer risk

There are no simple answers because it depends on your genes, the quality of the food, and more. There's a lot of searching for data to support a thesis, see the sugar industry attacks against fat and salt.

I highly recommend checking out Canada's Dietary Guidelines.

https://food-guide.canada.ca/en/

One of the only countries that created their nutrition guidelines based on the preponderance of evidence from high-quality studies and without influence from any food industry lobbies.

The illustration on the main page alone gives you a good representation of how your typical meal should look like.

If most people followed a diet close to these recommendations, then I expect health at a population level would significantly improve.