Bibliography (10):

1. The gut-brain axis: Identifying new therapeutic approaches for type 2 diabetes, obesity, and related disorders

2. Commensal bacteria and essential amino acids control food choice behavior and reproduction

3. Is eating behavior manipulated by the gastrointestinal microbiota? Evolutionary pressures and potential mechanisms

4. The Sense of Smell Impacts Metabolic Health and Obesity

5. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Enteric_nervous_system  :

      https://en.wikipedia.org/wiki/Enteric_nervous_system

   2. https://en.wikipedia.org/wiki/Vagus_nerve  :

      https://en.wikipedia.org/wiki/Vagus_nerve

   3. https://en.wikipedia.org/wiki/Cholecystokinin  :

      https://en.wikipedia.org/wiki/Cholecystokinin

   4. https://en.wikipedia.org/wiki/Purinergic_signalling#Nervous_system  :

      https://en.wikipedia.org/wiki/Purinergic_signalling#Nervous_system

   5. https://en.wikipedia.org/wiki/Glutamic_acid#Neurotransmitter  :

      https://en.wikipedia.org/wiki/Glutamic_acid#Neurotransmitter

   6. Optogenetics