Drugs are basically chemical compounds. Nutrients which your body needs are also chemical compounds. The origin of chemical compound is not what makes them good or bad, healthy or not healthy. The fact that a chemical is manufactured by a plant does not de facto mean it is good for you. Nor does the fact that the same chemical is manufactured in a test tube mean that it's bad for you.
Certainly medical treatments change as knowledge of human physiology and pathophysiology advances via scientific study. The advice of nutritionists similarly changes and such changes are not always backed up by sound scientific data.
If you can maintain your health thru diet and exercise and lifestyle choices, by all means do so. But this may not be successful in many cases.
Just my honest opinion.
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