Ultra processed people is a fabulous and very informative book.
Unfortunately our GPs must advise what the NHS advise which is at least 20 years out if date.
Therefore they will advise low fat foods, sliced ham etc ..all ultra processed foods stuffed with additives you really don't want for good health.
I am not a doctor but I do take my health seriously and avoid any "foods" which profess low fat, high protein, no added sugar etc. Look at the back of the packet and generally you will find a long list of additives and chemicals.
Just be sensible. Don't over eat. When you do try to eat the rainbow to get good nutrition. Reduce the amount of cheese and butter but don't replace them with ultra processed replacement products . Good luck .