> "Big glucose spike(s)" actually are the cause of diabetes. The more regular spikes a person has, the more resistant to insulin they become, which is where type 2 diabetes starts.
People who don't have diabetes or pre-diabetes spike. But I hardly see a body of work that suggests that everyone is at risk of diabetes.
> If plantains cause a large spike in a person, I would say that person should probably not eat them every day all the time.
People from South America eat them every day and they aren't linked to diabetes as far as I know.