For much of human history, we’ve turned to diets to lose weight and improve our health. But it’s mostly been in vain. No matter how much the number on the scale drops begins to go down, chances are that the weight will come back. That’s just what the science says. But when it comes to weight, the facts just don’t seem to matter. Losing It, a new series from Bloomberg’s Prognosis, looks at how we got weight loss so wrong — and whether there’s a better way forward.