both raise insulin... but differently and to different extents
wrong, what are you smoking, you have been wrong in every post in this thread. Fructose does not mediate insulin secretion, sucrose does but if you believe that to be evidence you are missing a key point.
fructose has an effect on circulating glucose but again, it's a totally different mechanism. The point you made about leptin is directly related to it's non insuligenic effect.
Dietary Fructose Reduces Circulating Insulin and Leptin, Attenuates Postprandial Suppression of Ghrelin, and Increases Triglycerides in Women
Karen L. Teff, Sharon S. Elliott, Matthias Tschöp, Timothy J. Kieffer, Daniel Rader, Mark Heiman, Raymond R. Townsend, Nancy L. Keim, David D’Alessio and Peter J. Havel
"However, not all types of dietary carbohydrate are likely to have the same effect on these signals of peripheral energy status.
Fructose, unlike glucose, does not stimulate insulin secretion from pancreatic β-cells (7). In rhesus monkeys, an 8-h iv fructose infusion resulted in markedly reduced insulin secretion and did not increase circulating leptin concentrations compared with infusion of the same amount of glucose, which increased plasma leptin levels by more than 50% above baseline fasting levels (
. Thus, similar to fat, fructose does not increase insulin-mediated glucose metabolism or circulating leptin levels. Even a relative deficit in leptin production has been shown to be associated with increased body adiposity in humans (9). In addition, it has recently been reported that an augmentation of the proportional amplitude (nadir to peak) of the 24-h diurnal pattern of circulating leptin concentrations was predictive of the extent of weight and body fat loss during a 12-wk ad libitum low-fat diet (15% of energy) (10). Therefore, it is important to determine the effects of dietary fructose on meal-associated insulin secretion and the diurnal pattern of leptin production in humans. This is particularly relevant in light of the fact that per capita fructose consumption has increased during the past three decades (11) within the same time frame as a marked increase in the prevalence of obesity (12, 13)."