Ok, I'm horrobly overweight but here are my tips,
Carrots, carrots, carrots.
Raw, they make a great snack. Don't both to have dips save as a treat. Rinse, to and tail, eat raw. Filling.
Cooked, filling.
Puréed, adds substance to gravy.
Fill up at meal times on veg. Including pulses. It sounds as though you need to be weaning yourself off carbs generally.
Cheap double protein, standard Italian " salad" tinned tuna, tinned beans ( not baked beans), raw onion and a tiny bit of garlic.
Tinned mackerel on baked potato with at least three vegs.
Don't forget you don't need much protein to survive, 2-4 Oz a day . Fill up on veg.
For breakfast, porridge. A dash of milk on the top if you like, half a banana, keep the rest for a snack later. Much more sustaining than toast or cereal, buy not in packets but large packs. If really hungry, eat porridge during the day. It's what the scots did. Their old diet, pre deep fried mars bars, was one if the healthiest in the world: herring/ mackerel, ie oily fish, porridge, kale. Milk and cheese occasionally. Try it. You'll find the pounds melting off. Tinned fish fine, fresh when you can.