It could be less than you think—but it could actually be more. Food politics writer Marion Nestle wrote a few weeks ago about the origins of the 2,000-calorie-per-day diet business, and notes that when the FDA set out to determine that number (in 1941), it found women typically reported consuming 1,600 to 2,200 calories per day, men 2,000 to 3,000 and children 1,800 to 2,500. But the FDA wanted one standard of daily caloric intake. It originally picked 2,350, except everyone said this was too high (“Nutrition educators worried that it would encourage overconsumption, be irrelevant to women who consume fewer calories, and permit overstatement of acceptable levels of ‘eat less’ nutrients such as saturated fat and sodium,” writes Nestle). So the FDA went with 2,000 calories instead, more or less because it sounded nice and was somewhat within the range of calorie-consumption totals people reported—not really based on the research. More »