The names of typical natural sugars end with the suffix -ose. In addition to fructose and sucrose, the most common one is glucose (dextrose). While our bodies handle glucose with less trouble than fructose or sucrose, any glucose we eat is very fast acting, spiking our blood sugar. That’s why some people use glucose tabs when they go hypo. The other common natural sugar, lactose, comes from milk. But sucrose and fructose are the only sugars used as added sweeteners.