Acetylcholine deficiency?
If you have an acetylcholine deficiency, you can eat more eggplant, among other things. Below are more tips to remedy an acetylcholine deficiency:
Acetylcholine deficiency
Read more here acetylcholine and diet/supplements

Would you like to read more about the other neurotransmitters? Here is a list of the articles that have already been written.
Neurotransmitters and nutrition | GABA| Glutamate | Dopamine | Serotonin