Though the series 1000-lb Sisters centers around the weight-loss journeys of Tammy Slaton and Amy Slaton, their other sister, Amanda Halterman, has also gotten in on the action. Through diet, exercise, and bariatric surgery, Amanda has lost around 300 pounds. Amanda grew up with Tammy, Amy, and their other siblings, in Shawneetown, Illinois. Like her sisters, Amanda developed an unhealthy relationship with food at an early age.