This case report video (Video 1, available online at www.VideoGIE.org ) aims to show and investigate the digestion process endoscopically. The subject of this experiment was the presenter, a healthy man in his 50s without any medication taken. The study was approved by the Ethics Committee of Nippon Medical School Chiba Hokusoh Hospital. After 12 hours of fasting, he swallowed, not chewed, boiled rice with sliced ham and seaweed (Laminaria japonica), including a small amount of sesame seeds, with 300 mL of water (Fig.