Read this recent brief overview of diet and fats and carbs and and cholesterol levels and heart disease risk and see if you would presume to advise patients on how to eat. I am glad that I am out of that business.
I have written several times on medical hubris . In light of what we think we "know" now and what I advised ten years ago,I think "who is without sin....." I believed I had the answer while having answers was little more than parroting the recommendations of boards and organizations.
You have to remember the lawyer's classic query "Doctor, where you wrong then or are you wrong now/"
Neither the pre-operative beta blocker debacle nor the post menopausal use of estrogen and progesterone missteps seem to be a teaching moment for the population medicine devotees. The pop med folks , as explicated here would presume to take funds away from the treatment of some to fund preventive program to others which would "after a few generations" bring about a utilitarian gain by some metric even as some might suffer now.
At the time of this writing serious doubt has been cast on the previously widely disseminated advice about how to eat to avoid heart disease and who should take aspirin for primary prevention of coronary artery disease and who , if anyone, shovel be screened to detect low vitamin D levels, just to name a few of the ever changing array of medical recommendation to prevent disease and death.
The internist who once upon a time was thought to be the physician trained to diagnose and treat complex complicated medical conditions has to extent that she is now a ambulist ( at least those who are not now hospitalists) sends her time in part giving advice about how to prevent disease. How to eat,how often to get a cervical cancer screening test or a colonoscopy , who should take statins of aspirin or vitamins and how much to exercise. For this you did not need to study four years in medical school and then three of more years of internal medicine training.You just need to subscribe to a service ( an app on your IPAD) to keep you up to date on the latest, and every changing, recommendation of various panels.