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.
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.
