There is a belief that walking just after a meal causes fatigue, stomach ache, and other types of discomfort. However, the author and one volunteer participant had no such negative reactions, and found that walking just after a meal was more effective for weight loss than waiting one hour after eating before walking. For people who do not experience abdominal pain, fatigue, or other discomfort when walking just after a meal, walking at a brisk speed for 30 minutes as soon as possible just after lunch and dinner leads to more weight loss than does walking for 30 minutes beginning one hour after a meal has been consumed. The author lost nearly 3 kg and a volunteer participant lost nearly 1.5 kg during one month of walking just after lunch and dinner. The author walked at a brisk pace, while the volunteer walked at a stroll. We repeated the preliminary experiment twice, between April and early May 2002, and once between August and September 2006, and obtained the same results.