Caffeine, for example, is an addictive substance, so some people may get withdrawal headaches, nausea, irritability, diarrhea, and even vomiting especially if they quit cold turkey instead of weaning off gradually
Where the research should go next Key open questions include how much endogenous GLP1 increase is needed for sustained weight change, whether combinations of diet, prebiotics, probiotics and nutraceuticals can match injectable outcomes, and the longterm safety of such combinations
Benefits of short-chain fatty acids and their receptors in inflammation and carcinogenesis
While GLP-1s offer undeniable benefits, long-term adherence remains a problem, access barriers persist, and the regulatory landscape around compounded versions is uncertain
role of central cholinergic system and vasopressin