Inspired by the musical classic by Frank Sinatra, this chapter makes it unmistakably clear: there are no universal paths to achieving a (slimmed-down) body. Sustainable and successful weight reduction can only be achieved by choosing one’s own, very personal “diet path”—where “diet” is actually the wrong term for this lifelong project. The design of strategies and measures for sustainable nutritional and lifestyle adaptations can only be implemented in harmony with one’s own personality as well as personal work and family life—meaning, individually. Everyone must choose the path for themselves that fully and, above all, permanently fits their own biology and character. There is no off-the-shelf recipe for success.