The provided context doesn't contain specific information about potatoes' direct effects on serotonin production or levels. However, the research does show that potatoes support gut health in ways that could indirectly influence serotonin, since about 90% of the body's serotonin is produced in the intestines.
Cooled potatoes create resistant starch (RS3) that functions as a prebiotic, increasing beneficial gut bacteria populations. According to Martínez et al. (2010) published in ISME Journal, resistant starch from potatoes increases Bifidobacteria and Lactobacilli in the colon. These beneficial bacteria are involved in producing short-chain fatty acids, particularly butyrate, which supports intestinal barrier function and overall gut health (Topping & Clifton, 2001).
The gut-brain axis research suggests that a healthy gut microbiome can influence neurotransmitter production, including serotonin, but the context provided doesn't include studies specifically measuring serotonin levels after potato consumption. Phillips et al. (1995) in the American Journal of Clinical Nutrition found that consuming 30g/day of resistant starch from retrograded potato increased fecal butyrate concentrations by 38%, indicating improved gut health.
For definitive information about potatoes' direct effects on serotonin, you would need to consult studies specifically measuring neurotransmitter levels or mood outcomes following potato consumption.