I’m sorry to say that you should cut out the porridge, it is quite high in carbs. You might want to look for something else to eat for breakfast like 2 eggs scrambled, grilled mushrooms with a poached egg on top or half a sliced avocade with an egg on top (one of my favourites), plain full fat Greek yoghurt with the berries. If you really have to have porridge the recipes in the book only allow 25 grams and even that amount can give you 20 grams of carbs which is nearly half of your daily allowance if you are sticking to 50g,
Sorry if it sounds harsh but the point of this diet is it is low carb and although oats are a slow burning carb they are still quite high.