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Fructose does not stimulate insulin secretion or enhance leptin production like glucose does
Monday, September 28, 2009 12:51 pm Email this article
"The digestion, absorption, and metabolism of fructose differ from those of glucose," notes a paper by obesity researcher George Bray and others.
[LIver] metabolism of fructose favors de novo lipogenesis [that is, the conversion of carbohydrates to fat].
"In addition, unlike glucose, fructose does not stimulate insulin secretion or enhance leptin production," they note.
"Because insulin and leptin act as key afferent signals in the regulation of food intake and body weight, this suggests that dietary fructose may contribute to increased energy intake and weight gain."
Comment: A recent study also found that fructose increases appetite, whereas glucose decreases appetite.
This is because fructose metabolism requires an enzyme that depletes ATP, the universal energy molecule, whereas, glucose increases ATP. Conversion of Carbohydrates to Fat is NOT Making Us Fat
Conversion of Carbs to Fat is NOT Why Carbs Make Us Fat
Comment: Conversion of carbohydrates to fat is not what is making us fat according to research from J. P. Flatt.
Interview with Carbohydrate Researcher
See the interview with carbohydrate researcher JP Flatt
See the eye-opening interview The truth about carbohydrates: An interview with researcher Jean-Pierre Flatt, PhD.
Biggest Myth in Obesity Research
This is the biggest myth in obesity research
I believe this is the biggest myth in obesity research, that is, the idea that the conversion of carbohydrates to fat is what is making us fat.
Sugar Busters Got it Wrong
The doctors who wrote the book Sugar Busters got it wrong
If I remember correctly, the doctors who wrote the book Sugar Busters (1996) said in an interview on television something like, “Nearly all of the fat on our bodies comes from carbohydrates in our diet.”
This is complete and utter nonsense.Research Shows Exact Opposite of What They Said
Research Shows Exact Opposite of What Sugar Busters Doctors Said
The research shows the exact opposite is true.
That is, that almost none of the fat on our bodies comes from the carbohydrate in our food.
Body Fat Comes From Dietary Fat
Nearly all the fat on our bodies comes from the fat in our diet
It is nearly all from the fat in our diet.
Why Carbs Make Us Fat
Carbs make us fat because the reduce the amount of fat that is burned
The reason that carbohydrates make us fat is because they reduce the amount of fat that is burned for fuel.
We Can Only Store About 2 Lbs of Sugar
We can only store about 2 lbs of sugar, so the body must burn carbohydrates before burning fat
The body can only store roughly 1000 grams of carbohydrates—roughly 2 pounds—but we can store hundreds and hundreds of pounds of fat.
Carbohydrates are stored in the body in the form of glycogen, which are a bunch of glucose molecules stuck together.
So when you eat carbohydrates all day long, such as snacking on cookies, crackers, chips, sweets and sugary soda, your body will burn the sugar first and tell fat cells, “Hey fat cells, I have to burn this sugar first because there isn’t enough room to store it. So don’t release any fat right now because I don’t need it.”
So this is why carbohydrates make us fat—they reduce the amount of fat that we burn.
It’s not because carbohydrates are being converted to sugar.
Bray G, Nielsen S, Popkin B. Consumption of high-fructose corn syrup in beverages may play a role in the epidemic of obesity. Am J Clin Nutr. 2004 Apr, 79(4):537-43.
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