Tailoring a person's diet or medicine based on their genomes has been a goal of the medical community for decades, but the strategy has not been widely successful because people metabolize chemicals differently. A drug may work differently for two patients because they have different metabolism, which may be a result of genetic, environmental, or microbial differences.
source https://www.lifetechnology.com/blogs/life-technology-science-news/worms-as-a-model-for-personalized-medicine
