Well, it depends on the individual ingredients, of course. Tomatoes can be tricky. White sauces typically have white flour, and if commercially made, may have sugar or even HFCS.Hi. I'm wondering how safe it is to eat various sauces: tomato, barbecue, marsala, francese... The meat itself is okay to eat, but I would think the sauce that's on it could make a difference in blood sugar levels ???