Deep in the archives of the American Journal of Nutrition lies a study where researchers tested whether blending protein shakes for varying times had an effect on the satiety of test subjects.

Twenty-eight men consumed breakfast, lunch, and dinner in a laboratory one day a week for four weeks. On three of the days, subjects received a 499-calorie shake 30 minutes before lunch.

The shakes, however, varied in volume. Some were 300 mL, some were 450 mL, and some were 600 mL. The changes in volume were accomplished simply by blending the shakes longer – letting the blades of the blender gulp in more air and pump up the shakes.

The men who drank the 600 mL shakes ate 12% fewer calories in the subsequent meal. They also reported feeling more full and a greater overall reduction in hunger. The 450 mL shakes had the same effect, but not to the degree of the 600 mL shakes.

To try it out, simply let your blender whip up your protein shake for 15 to 20 seconds longer until you notice the volume rise. If you're using a stick-style hand blender, blend your shake with a portion of the blades above the liquid to increase aeration.

Whether you drink one, two, or three shakes a day, pumping them up with air and increasing your satiety can cause you to leave a considerable amount of calories on the table, making fat loss all the more rapid.

1. Rolls BJ et al. Increasing the volume of a food by incorporating air affects satiety in men. Am J Clin Nutr. 2000 Aug;72(2):361-8.