I don’t know. I see arguments that higher ketones are better, say from a weight loss perspective. While I don’t think this is true, I also don’t know. And I’m an outlier. You don’t find many people on this board with 6 years of low carb/keto. And I do want my ketones “higher”, as I have idiopathic dilated cardiomyopathy, a type of heart failure. There’s evidence the failing heart likes ketones.
But realistically, I have thousands (over 2,000) tests of breath, blood, and urine ketones and different blood sugar levels. And I could never tell anything. For instance, does eating protein lower ketones? My test results were inconclusive.
About the only things that are true: fasting for more than one day causes ketones to go up; exercise typically causes a blood sugar increase and ketone decrease (though this depends on the exercise and even this doesn’t pan out all the time).
That’s all I could determine after 2,000+ samples.