The differential abundances for the top 10 and bottom 10 with mean (bar) and model 95% confidence interval (error bars) associated with cognitive Ketogenic (more positive, green) and low-fat / american heart association diets (more negative, blue) (A, B, C). The log-ratio (y-axis) of the top and bottom bacterial strains (D), and sum of the top and bottom 10 foods (E) or metabolites (F) plotted across time (x-axis) and colored by diet. Presented diet stage p-values in log-ratio plots are determined from linear mixed effects models with fixed effects of diet, cognitive status, period, and diet sequences with random effect of subject.