I typed a massive post and lost it!!
Good things to eat. Lean meat, eggs, fish, berries, small amounts nuts, whole grain bread, brown rice, grains like quinoa, small amounts of dairy, veg, salad. Yoghurt like total full fat is lowest in sugars - lot of low fat stuff has sugar to replace fat
So breakfast - think porridge, yog and berries, whole grain bread with eggs/marmite/scraping peanut butter
Lunch - soup, salad, lean meat, or (I try to avoid bread twice a day) sandwich packed with salad and lean meat
Tea - meat/fish, veg, salad, sweet potatoes
Snacks - yog, berries, handful nuts (high cal but good for u mainly), boiled egg, piece of ham
Try to have protein (eggs, meat, fish) at each meal as fills you up and stabilises blood sugar more
White things (bread, potatoes, rice) tend to give you a sugar high but then a quick drop whereas things like whole grains give you a slower release