Thirty-two male volunteers participated in two studies measuring the effect of different protein sources on food intake and satiety. Pea protein was compared to whey, casein, and egg albumin. In the first study, subjects were given a 20g protein shake made with a random protein source. Satiety was then measured at 10 minute intervals and food intake measured at a meal 30 minutes after. During the second study, the 20g protein shake was given wit h food intake and satiety measured immediately after. In the first study, food intake 30 minutes after was significantly lower only after casein and pea protein pre load, compared to whey or egg albumin. Not surprisingly, subjects also reported higher feelings of satiety with casein and pea protein. Despite food intake b being higher with whey protein, the total amount of calories ingested with casein or pea + meal was similar to the amount of calories consumed when using just water as a preload. In the second study, protein preloads did not induce a reduction in intake when food was given immediately after. In fact, subjects tended to eat more in this setting. Based on this research, pea protein shows a promising effect on lowering short term food intake when given 30 minutes before.
Reference: Abou-Samra et al. Nutrition Journal 2011, 10:139 http://www.nutritionj.com/content/10/1/139