Eating anything 20-30 minutes beforehand will do that. Even eating a meal more slowly will result in eating less due to feeling sated sooner. The first bullet

Eating anything 20-30 minutes beforehand will do that. Even eating a meal more slowly will result in eating less due to feeling sated sooner. The first bullet point here is relevant: http://zenhabits.net/5-powerful-reasons-to-eat-slower/ http://zenhabits.net/5-powerful-reasons-to-eat-slower/