In Greek schools there was no lunchtime. In my day, we had morning and afternoon shifts, so we were either out by 1.30 or went in at 2pm, so lunch was always at home. There was just a canteen with snacks (like crisps and doughnuts) for break time. Those have been upgraded since.
At my son's preschool, afternoon shifts are required to bring their own packed lunch (morning shifts are offered snacks and a drink), and we were warned at the beginning that sweets were not allowed and would be confiscated.