These days, there are so many diet plans, it’s almost impossible to keep them all straight. Any diet book that becomes a blockbuster inevitably spawns variations as publishers seek to capitalize on a trend—until the next big idea comes along, and throngs rush to embrace yet another new approach. Each diet is different, yet it seems to be accompanied by a raft of testimonials and purported science, showing why it is the ultimate diet for weight loss or health—or both. Adding to the confusion are media reports of research studies that claim to “upend everything we thought we knew about nutrition.”
