I'll chip in my two cents. Type II diabetes and obesity are epidemic. The cause is improper nutrition, the consumption of unnatural, man-made foods, aka processed foods, made of 3 core ingredients - flour, seed oil (corn, sunflower, canola, safflower, etc), and sugar. The solution is to never again eat any processed food, nothing in a box or a can (sardines excepted), to switch to the natural foods our bodies are evolved to process, the foods we consumed before the First Agricultural Revolution. Those foods are meats, fish, eggs, greens, nuts, summer fruits, perhaps dairy/cheeses. No flour/bread/pasta, no man-made oils, no sugars, so no processed foods.
The 3 macronutrients are fats, carbohydrates and protein. This is a diet much lower in one of those macros - carbohydrates. When you cut down on carbs, by default you are eating more fat, as protein is relatively fixed. So it is a diet low in carbs, high in fat. A high fat diet to lose weight! Some call it LCHF - low carb, high fat. Some call it the ancestral diet, keto, Atkins, whatever. It is eating only the 'real' foods our bodies are evolved to process, and zero 'fake' food. We're wired to burn fat, not sugar. Historically, sugar was very hard to come by - seasonal fruit and perhaps honey. Today it is everywhere - HFCS and frankenfruit 24/7/365. And yes grains are sugars - they break straight down into sugars once ingested.
Simple. Not easy, but simple. Not easy because sharply modifying something as fundamental as eating habits is a challenge, plus we've been led to believe in recent decades that fat is somehow bad! Cut out all sugars, including grains, and all veg/seed oils (stick with a bit of olive oil). Burn fat, not sugar.
If you wish to know more about LCHF, youtube is a fantastic resource. Dr. Robert Lustig on sugar. Low Carb Down Under. Dr. Ted Naiman. Dr. Ben Bikman. Etc.
