Summarizing the previous sections, we have demonstrated that the gastric accommodation reflex in man involves the release of serotonin and the activation of a nitrergic motor neuron. We observed that almost half of the patients with functional dyspepsia have an impaired accommodation reflex, and this is associated with early satiety and weight loss. Drug-induced inhibition of the accommodation reflex is able to induce early satiety in healthy subjects. Administration of the anti-migraine drug sumatriptan, an agonist at 5-HT1P receptors on gastric myenteric neurons, causes a relaxation of the proximal stomach in man through a nitrergic pathway. Pretreatment with sumatriptan is able to restore impaired accommodation and to improve early satiety in patients with functional dyspepsia. We conclude from these data that fundus-relaxing drugs may have a therapeutic potential in functional dyspepsia, and we hypothesize that fundus-contracting drugs may have therapeutic potential in the treatment of obesity.