Ozempic and GLP-1 cause weight loss via the vagus nerve. In people whose vagus nerve was surgically cut (below the diaphragm, not in the neck), GLP-1 did not reduce food intake or accelerate metabolism. These drugs work through the vagus, in ways we still do not fully understand.
ALT https://pmc.ncbi.nlm.nih.gov/articles/PMC8714868/