Blood and insulin benefits - Many foods that have in them glucose are sweet, but our bodies (and especially liver) have larger problem disassembling glucose than fructose that can be found in sugar. Because of this, insulin levels will be greatly increased during the short periods of time, making you feel energetic and powerful. Sadly after that initial rush, drop of insulin will also make you hungry for more sweets. But that is not all. Because of the influence of sugar’s glucose has on the hormone leptin, you will indeed feel more full than after eating foods with fructose.