Hi
@CamGreen and welcome.
I remember those early supermarket hunts only too well. Bascially anything in packet or tin is likely off limits, except very dark chocolate, 85% cocoa or higher if you can build up to that.
Just think real food, single, easily identifiable one word foods, then put them together to make tasty meals, so:
Beef, pork, lamb, chicken
Fish, shellfish,
Eggs
Cheese, cream, plain yoghurt
Green vegetables including salads
Olives, nuts
If its in a packet it will have been processed and adapted and is likely too high carb .
My supermarket shop is now very quick as I don't even need to walk down most aisles