That's based on diet intake surveys, it's based on levels of obesity, it's based on a range of factors that gives you an approximate guess as to how much food is actually going into people's mouths.
这些数据是基于食物摄入量的调查问卷基础上， 再加上肥胖程度和很多其他不同的因素， 来得出一个大概的 关于究竟有多少食物真正进入了人们的口中的推测。