Comment by DougWebb

Type II is caused by chronic ingestion of excess carbohydrates, which leads to insulin resistance in those who are genetically susceptible to it. The mechanism is that the carbohydrates are broken down into glucose in your blood, which must be removed because high blood glucose for an extended period causes severe disease. Higher insulin levels drives glucose into your muscles until they can't take any more, your other cells until they can't take any more, your liver until it can't take any more, and then stored as body fat until your fat cells can't take any more. When everything is full, higher and higher levels of insulin are needed to stuff more and more glucose wherever it can be stuffed. That's Type II diabetes.