It's also important to consider that drugs work by leveraging a particular mechanism in the body into increased action, creating chain-reactions that are fueled by vitamins and nutrients. As a result, sustained use of that drug (or even short-term use of drugs that act aggressively) would make relevant vitamin and nutrient levels trend towards depletion, among the other listed side effects of that drug. If you take any medications, a normal diet may not be enough to mitigate this.