Hi and welcome. Porridge isn't ideal as it is a carb. Small portions would be fine. I have oats in muesli with cold milk which avoids the 'stewed' oats in porridge which will be higher-GI and spike the blood sugar a bit more. Most of us would advise you to get a glucose meter so that you can check your own blood sugar and see what foods affect you most and by how much. The SD Codefree on the web is one of the cheapest. Although all milk has a bit of sugar in the lactose, I wouldn't worry unless you drink gallons of it. I believe skimmed milk has more sugar than full fat so if you like full-fat why not change to that (don't worry about the fat in it)