To rev weight loss, try adding collagen to your favorite smoothie. It's long been touted as a miracle anti-aging ingredient, but this protein also has powerful slimming effects. That’s because two amino acids in the protein (glycine and arginine) increase the production of metabolism-revving human growth hormone and lower the output of hunger hormones. In fact, in a study in the journal Clinical Nutrition, subjects who had collagen at breakfast felt 40 percent more satiated than those given whey or soy protein – and they ate 20 percent less at lunch 4 hours later.
For best results, look for a powder with 2.5 grams of collagen peptides, like Reserveage Organics Collagen Replenish. This form of the protein is better absorbed by the body to maximize slimming perks. Bonus: Collagen peptides reduce the appearance of wrinkles by 20 percent in 8 weeks.