Welcome to the forum lochness.
You'll find all starchy foods like potatoes (especially mashed ones) will raise your levels nearly as badly as eating sugar. Starchy foods include potatoes, rice, pasta, cereals, bread and other flour based products. Try halving all of those and up your green veg, meat, fish, cheese and eggs to compensate. On the starchy foods you keep swap to brown basmati rice, brown or tri-colour pasta as the brown versions won't raise your levels as much. Most of us find Burgen soya bread that you can get from most supermarkets to be the best.