Lecithin provides choline, which is a precursor for the neurotransmitter acetylcholine in the brain.(1) Choline is also necessary to remove fat from the liver.(2) Thus, supplementation could be extremely beneficial for alcoholics to prevent against cirrhosis.(2)
References
1. http://www.jacn.org/cgi/content/abstract/11/5/473
2. http://www.medschool.northwestern.edu/newsworthy/past-years/2002/2002H-May/choline.htm
