Protein requirements are vastly overestimated in America compared to plenty of countries where there are long living people eating a lot of carbs and less protein
I think humans can do fine on carbs, but I think you’d need to provide a citation stating our expected requirements are “vastly overestimated”. Furthermore, we do all kinds of problematic things to our grains in America.
Unfortunately dietary science in the US is largely funded by private companies and leans towards their interests. Furthermore, there are very few international studies comparing different diets. Also, i see very few comments on HN with citations bc the comments are for opinionated discourse of facts
That doesn’t mean it’s unreasonable to ask for citations when one could be supplied. E.g. a reference to daily recommended nutrition from other government agencies would have been very useful to this opinionated discussion.