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Fructose decreases fat burned when on a low calorie diet
Wednesday, December 08, 2010 8:10 am Email this article
Fructose decreases the burning of fat more than glucose when on a reduced-calorie diet according to a recent study from Purdue University. Blood Sugar And Insulin
Blood sugar and insulin increase more with glucose than fructose
Ffity grams of glucose caused blood sugar levels to increase 16 percent more than when they were given fifty grams of fructose, and increased insulin levels 31 percent more.
Fructose Reduces Fat Oxidation More Than Glucose
When subjects were on a reduced calorie diet, there was no difference the amount of fat or carbohydrates that were burned (fat oxidation and carbohydrate oxidation) after consuming fructose versus glucose, even though blood sugar levels and insulin levels were higher after consuming the glucose.
Surprisingly, when subjects were on a normal calorie diet, they burned 39 percent less fat and 31 percent more carbohydrates when they were given fructose compared to when they were given glucose.
“The data suggest that the use of fructose in supplements/meals may provide no additional benefit in terms of [fat burning] during a weight loss program involving diet and exercise,” the authors of the study concluded.
Subjects: 14 Adults
The study involved 14 adults with a average age of 26, and an average body mass index of 30.
The subjects were either on a normal calorie diet or a reduced calorie diet for six days.
On the seventh day, they performed aerobic exercise for 40 minutes and were then given a liquid meal containing either 50 grams of fructose or glucose.
Fat oxidation and carbohydrate oxidation was then measured for the next three hours.
Fructose Versus High-Fructose Corn Syrup
Most high fuctose corn syrup contains 55 percent fructose and 45 percent glucose. It may be worst of all as far as weight control.
The reason is that fructose in the presence of glucose raises blood sugar and insulin levels more than fructose alone. It potentiates glucose-insulin release.
So given the present study—that fructose decreases fat oxidation more than glucose—and that fructose potentiates glucose-induced rises in blood sugar and insulin levels, this suggests that high-fructose corn syrup seems to be the worst of all.
Tittelbach T, Mattes R, Gretebeck R. Post-exercise substrate utilization after a high glucose vs. high fructose meal during negative energy balance in the obese. Obes Res. 2000 Oct, 8(7):496-505.
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