The theory of why eating fructose, or fruit sugar, does not reduce appetite may be due to it being a more nutritious source of calories than other sugars. Thus, eating fruit sugar does not make us feel full as quickly because the body needs the nutrients and calories to survive. This makes sense for cavemen of yesteryear, but for humans today eating lots of fructose along with other sugars may be overloading our bodies with excessive calories. The result: increased fat storage! It doesn't help matters that fructose is cheaper than other sugars like glucose. This is why food manufacturers prefer to use this form of sugar as a sweetener.
Brian Danley, CFT
"Motivation is what gets you started. Habit is what keeps you going."