You are absolutely right. Taking responsible for your own health is the only thing that will help you long term. Doctors in general are not trained in nutritional science, and are typically as unhealthy as the rest of the population. So you need to either get advice from a nutritional expert or read books that teach you the skills needed. That’s what I did and it saved my health. I recommend reading “How Not To Die”. It’s the best “one book solution” I have read so far.