It is likely that the larger number of statistically significant changes to the microbiome observed in the groups switched from WD to LD reflects their more numerous exposures to different diets, longitudinal changes in dietary exposure, the stress associated with diet switch, the negative energy state achieved by treatment and/or diet-driven weight loss, or a combination of these factors, but it may also be related to differences in terminal body weight and fat mass since both adiposity and diet composition have been shown to modulate the mouse gut microbiome profile
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B12 is naturally found in animal products like meat, dairy, and eggs, making vegetarians and vegans more susceptible to deficiencies
Autoimmunity DrMR: Now, regarding immunity/autoimmunity, I know a fair amount of our audience struggles with thyroid autoimmunity, some with various GI autoimmunity, probably have some rheumatoid arthritis followers also