We know that obesity can be socially contagious, however we know that social networking sites play a significant role in fat reduction besides, particularly team-based excess weight loss competitions," said lead author Tricia Leahey, Ph.D., of The Miriam Hospital and Alpert Medical schooling. "In our very own study, weight loss clearly clustered within teams, which suggests that teammates influenced each any other, perhaps by providing accountability, setting expectations of weight loss, additionally providing encouragement and support.