If you want to lose weight, ditch the porridge and eat something less in carb. How about a 2 egg mushroom omelette instead? Believe it or not, its fairly filling. 2 rashers of back bacon with 2 fried eggs and 2 dsp of tinned chopped tomatoes is also filling. In the past, I never believed that I would feel full up eating this type of stuff but it does work so try and see for yourself.
Remember to bolus for protein even though there's virtually no carb. I use the divide by 3 to calculate the bolus but some just use divide by 4. Add up the total protein of the food and divide it by 3 or 4 and use that figure to bolus.
Protein in the absence of carbs converts to glucose by around 50% so you do still need to take this into account, however it does so more slowly than carbs so you have to be careful with your insulin as you might go hypo postprandial, I found when I went low-carb the only way round it was to split-dose to allow for the delayed effect.