对于摄入糖分减少的原因，研究人员认为与人们饮用甜味汽水的减少有关，但张芳芳强调，糖类常常被加入到甚至不怎么甜的食物当中，比如酸奶和番茄酱。
The researchers thought the reason for the decrease in sugar intake is drinking less sweetened soda, but Dr. Zhang emphasized that sugar is often also added to foods that are not very sweet, such as yogurt and ketchup.