" The USDA statistics, however, were based on guesses, not reliable evidence. These statistics, known as “food disappearance data” and published yearly, estimate how much we consume each year of any particular food, by calculating how much is produced nationwide, adding imports, deducting exports, and adjusting or estimating for waste. The resulting numbers for per-capita consumption are acknowledged to be, at best, rough estimates. "

― Gary Taubes , Good Calories, Bad Calories: Challenging the Conventional Wisdom on Diet, Weight Control, and Disease