Starter as I know it is typically AP or even bread flour and water or milk basically fermented. I have to "convert" one to whole wheat flour, I might even try to feed it buttermilk along with WW flour. It take a couple weeks in my house to get it really going, it never gets above 65 in here. So I'll have 100% WW bread Just an experiment though. That last loaf came out REALLY tasty and kiddo loves it. I was going to make one but the time it takes was going to kill me. Too many irons in the fire so I bought it. Bread Pal. It's great. I use it A LOT. I'm the guy that fusses when the cheese or bread is cut crooked so it was a MUST have. Pricey but good quality and easy to use. Best reviews on bread slicers out there.