I agree that cutting back on sugar-enriched foods and drinks is a good idea. This is because consuming sugar-rich foods and drinks leads to a "spike" of insulin release; this can lead to what is called insulin resistance which is a risk factor for Type 2 diabetes.

I am less sure about carbohydrate-rich foods as a group. In some of them (eg, white bread) the sugar in them is released rapidly during digestion; they are called "high GI" foods - this can lead to insulin resistance.

In other carbohydrate-rich foods (eg, wholemeal bread, brown rice, legumes and vegetables) the sugar in them is released slowly during digestion; they are called "low GI" foods. They are good sources of many nutrients as well as fibre which is protective against cardiovascular disease and colon cancer.