I haven't even checked my ketones since I started 150 lbs ago. I have gone from mostly meat ,eggs,cheese and totally cooked the nutrients out vegetables to a diet of as much green salad as I can eat,lots of sardines, salmon,and tuna, some beef and chicken but more fish and less meat all together. I still eat a good many eggs too. I just adjust as I try to experiment a little when I study different foods and what they do for us or sometimes to us. I've cut out some things like tomatoes and milk and sugar and so far potatoes,pasta are rice, completely. I have recently added in more nuts, beans,seeds, and the oats as an experiment on how I feel and how my body reacts by gaining or staying the same.
I honestly think everyone has to tune their diet for what works for them, Some things should be a given though to stay away from like sugar,processed foods, and things like highly processes flour that makes the cheap white bread and all the major cereals, white rice,and fried potatoes. I think these should only be enjoyed as an occasional treat if you just can't help yourself in anybody's diet,even if they don't want to lose weight,just because of health concerns in general.. How radical you want to get with weight loss and health recovery just depends on your goals after that,but the best way is always to learn what the healthiest foods are for you specifically and only eat those and stay away from any man made garbage processed foods or ingredients.