Use butter, full cream milk. The best of everything. A little good stuff, is better than so called ‘healthy options’ that often have additives. Ready meals, the premium sort, M & S particularly, are fine. My Mom had renal problems, and her consultant advised her thus. She kept a healthy weight, and constitution for years. We have recently been advised by my DH’s oncologist to take a few tips from Dr William Li, his book ‘Eat to Beat disease’, is our bible at the moment. All jolly sensible, and easy. He has a lot of YouTube videos too, so you can see if you agree with his opinion. Keep everything easy and simple to do, keep a stock of ready made things, soups etc. you are much more likely to eat then. I know that a lot of the time it just seems like too much bother. Hope you feel better soon. 💐