Every year we spend over $60 billion dollars on dieting in the USA alone. Between Paleo, raw foods, superfoods, juice cleanses, gluten-free, sugar-free, fat-free, carb-free, and about a million others, fad diets are doing pretty well for themselves these days.
Spinach is a great source of iron! Except no, no it isn't. That was debunked in the 1980s . . . someone misplaced a decimal point in the '30s, and everyone since has thought it had 10 times more iron than it does. Or was it the 1890s? Or . . ..