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If a healthy person is a person who is totally free of disease, then we do not have the ability to determine whether or not a person is healthy. That has nothing to do with developing drugs for and treating the subset of diseases that we know about because they present with obvious and intuitive symptoms relatively speaking.

I disagree about LDL. It’s not as simple as LDL. There are different kinds of LDL and some are worse than others as is pointed out in that link, I think. Medications that reduce LDL do other things too and it’s not clear that their effect on LDL is the real vector for their efficacy. And people with elevated LDL sometimes don’t develop the diseases that high LDL supposedly causes. It’s a broken model based on an overly intuitive interpretation of legitimate data.

I read a biochemistry textbook. The same one you guys read. The only time it mentioned ketosis, it was a brief footnote in effect saying “ketosis is a dangerous abnormality and results in diabetic ketoacidosis.” It was literally a sentence or two for the whole metabolic phenomenon of ketosis. A widespread textbook printed in the last 5 years if I recall. That’s when my eyes were opened to the possibility that the doctors have been making oversights. How could you blame a doctor for believing his textbook?