A significantly greater reduction of the severity of the key gastroparetic symptoms-nausea/vomiting ( P = 0.01 ) , postprandial fullness ( P = 0.02 ) and bloating ( P = 0.006 ) - were seen in patients who received the intervention diet compared with the control diet , and this was also true for regurgitation/heartburn ( P = 0.02 ) , but not for abdominal pain .