Not a doctor, but from what I have seen, there is a healthy amount of spiking from eating normal foods, but our modern diets are so sugar and carb heavy that the glucose spikes are way outside the range that our bodies evolved to handle. Hunter gatherers would maybe eat some berries here (much smaller and less sweet than modern berries) and there. The modern human eating pizza, tons of bread, ice cream, soda, etc. creates such massive glucose spikes that they are unhealthy and unsustainable for the pancreas to handle for 60+ years.
Again, not a doctor and not sure if this is accurate, but this is my very limited understanding
Again, not a doctor and not sure if this is accurate, but this is my very limited understanding