Health Brand new twosie diet is a real doozy Brand new twosie diet is a real doozy Reports of rapid-weight loss are fueling trial of The Twosie Diet. For $99, you can rent a two-year-old toddler for two weeks. Then chase him or her around the house—and watch the pounds fall off. While some users report numerous falls from tripping over scattered toys, this is one diet that actually seems to work. Daily steps goals? No prob.