Know whom to listen to. Know whom to consult for what.
For example, to remove a brain tumour go to the brain surgeon, by all means. If you get injured in an accident, head for the nearest hospital.
But for advice on how to maintain and enhance your overall health, don't listen to doctors and scientists, and don't listen to so called nutritionists.
The question naturally arises, whom should you listen to? Unfortunately, you have to make that choice, based on your own independent judgement.
Because anyone can mislead you.
Listen to everyone. But use your common sense.
Decide what is important to you, and what your priorities are, because your priorities and first principles will determine how you weigh the evidence, and which path you choose to take.
Reject what is untrue, even if it comes from so called experts.
To decide what is true and untrue, it helps to go back to first principles. It helps to go back to the universal laws which cannot be broken. It helps to go back to ancient wisdom which has been formulated based on millennia of human experience.
It only helps, for to convert that to a practical template for living, you have to interpret it in today's context, and implement it in a way that fits your own unique individual requirements.
It helps to think for yourself.
What you cannot do, at any cost, is to keep aside your questioning mind, and accept something at face value just because an "authority" says so.
You cannot outsource your thinking, in short.