>>15140457I'm generally not a fan of what I call the "but what about these isolated island" dietary studies. I could use that in my favour and quote isolated pacific island native tribes eating 90% fats from coconuts and fish, and also being among the healthiest in the world, but I won't because the sample size.
The more honest approach is working backwards from a medical perspective. What causes insulin resistance for example? Well, high blood sugar does. You (mostly) require carbohydrates to spike and influence your blood sugar levels, creating the insulin resistances which result in disease. What about cavities? Same thing, your biome in your mouth requires sugars and starches to produce plaque. What about gut inflammation? Well, the parasites within your gut microbiome mainly digest carbs as a primary source of fuel. An overabundance of roughage, and most toxic - FODMAPS, create the bloating gas and hyperpermeability (leaky gut syndrome) which results in your immune system attacking your own colon (IBD, cancer, crohns) if this inflammation is left unchecked.