I'm Type 2 diabetic and I love potatoes, the only ones I have found which contain less starch are Vivaldi and they're tasty too, the only place I found I can get them is Sainsbury's, they sell small salad type and large baking types. I never mash them as I was told this releases more starch. It's also possible to grow them in the garden or in potato sacks if you have the room.