"Gardner's study stems from his previous research, which suggests a diet's effectiveness may be due to how insulin-resistant the dieter is at the outset." What

"Gardner's study stems from his previous research, which suggests a diet's effectiveness may be due to how insulin-resistant the dieter is at the outset." What if it also depends on the subject's microbiota, which would be impacted by a number of things including the (unwanted) consumption of residual antibiotics in meats. Seems like the more we find out, the more questions there are.