I've read some studies that suggest that the gut microbiome can influence mood and behavior through the vagus nerve, which connects the gut and the brain. For example, this[1] study showed that mice fed with a probiotic bacteria had lower depressive and anxious behaviors than mice whose vagus nerve was cut. Another study[2] showed that oral treatment with antidepressants altered the gut microbiome and increased vagal activity in rats, and that blocking the vagus nerve abolished the antidepressive effects. These studies imply that the gut-brain axis is more complex than just diet and microbiome diversity. Maybe there are other factors that mediate the effects of fat, protein and carbohydrates on mood and mental health. What do you think?[1] https://medium.com/microbial-instincts/how-gut-microbes-talk...
[2] https://www.nature.com/articles/s41598-019-50807-8
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