Do you sometimes buy things that are unhealthy for you? (Most people do.) Do you feel guilty for it? or have you accepted it's a normal & kinda necessary part of your life?
I keep lengthy shopping lists and that lets me keep a handle on what I buy and therefore what I eat. So I've cut right down on UPF, added sugar and snacks. That does make it a bit tricky for guests as I now just buy what I eat. When my uncle stayed last Christmas I said, if he wanted anything other than porridge for breakfast, he'd have to bring it. Lo and behold on Boxing Day, "what's for breakfast?" "Surely you have some bread..." "No biscuits to go with my tea?". 🤷
I also plan to help reduce food waste and recycle packaging. So I usually know roughly what I'm going to eat in the next week or two and buy what I need accordingly. I also make sure I have plenty of frozen fruit and veg, as well as tins of pulse and tomatoes. Plus plenty of herbs and spices. It's really helped cut down on what gets thrown away.