It patches the reward center in the brain, which improves everything downstream of that (as mentioned in llm_nerd's sibling comment to yours).

https://news.ycombinator.com/item?id=45907422 (citations)

(i am hopefully that probiotics might be a future path to curating gut microbiota that meets an individual's GLP-1 in vivo production needs based on target metabolic outcome, but immediate intervention is welcome for obvious health reasons at scale)