However, the composition of both these types of sugars depend upon the source of the agave nectar. For example, in one type of agave plant, the percentage ratio of fructose to glucose is found to be 92:8, while in another source, the same could be 56:20. Coming to sugar, here, we are referring to table sugar, which is basically a carbohydrate composed of sucrose, lactose, and fructose. The primary sources of sugar are sugar canes and sugar beets.