Here in the UK what is touted as a healthy diet, includes far too many carbs for a type 2 diabetic. for years they've banged on about 5 a day, eating 5 portions of fruit and veg. The recommended meal plan by the medical profession following the NICE guidelines involves basing the diet on approx' 60% carbs.
Many people have found that having religiously eaten the right healthy things all their lives, they've been driven into type 2 diabetes. Unfortunately unless they have an enlightened GP or DN, they will continue eating what they are told is healthy, without realising that that was the problem all along.