05-22-2009, 08:18 AM
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#19 (permalink)
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Senior Member
Join Date: Apr 2007
Posts: 532
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"I don't think he ever said you can get fat without a positive energy balance" Excerpt from Bray's review of Good Calories Bad Calories comment made by Taubes Response made by Bray
“Comment: Consuming excess calories does not cause us to grow fatter any more than it causes a child to grow taller. Expending more energy than we consume does not lead to long-term weight loss; it leads to hunger.ffice ffice" />
Response: Consuming excess calories routinely produces obesity, and consuming fewer calories than your body needs produces weight loss.”
On another note eating fruit per se does not make you fat anymore than eating chicken will make you fat. Excerpt from Knowledge and Nonsense:
Bodybuilders trying to get lean shouldn’t eat fruit
The fear of fruit comes from studies suggesting that 60 grams or
more of fructose per day can upregulate de novo lipogenesis (the
process where excessive carbohydrates are converted to
triglycerides in the liver), increase blood triglycerides, and
induce insulin resistance. Keep in mind, fruit generally contains
6–7 grams of fructose. That means it would take a bunch of fruit
to get 60 grams of fructose. In most studies, the high
consumption of fructose is generally due to the consumption of
high levels of high fructose corn syrup (processing where
varying portions of glucose are converted to fructose). Another
consideration is that fructose causes minimal insulin secretion.
Even if fructose consumption were high enough to elevate fat
synthesis, a lack of insulin would probably result in increased fat
oxidation. Assuming a calorie deficit, it all evens itself out at the end of the day. Eat fruit because it's nutritious and generally low
in calories.
The entry of fructose into cells is not insulin-dependent (unlike
that of glucose entry into specific tissues), and in contrast to
glucose, fructose does not promote insulin secretion. Fructose is
a potent regulator of glycogen synthesis and liver glucose uptake.
Because of its lipogenic properties, excess fructose in the diet
can cause glucose and fructose malabsorption and greater
elevations in TG (triglycerides) and cholesterol compared to
other carbohydrates. In the liver, fructose is metabolized into
glyceraldehyde and dihydroxyacetone phosphate. These
particular fructose end products can then readily converge with
the glycolytic pathway.
Fructose’s ability to bypass the main regulatory step of
glycolysis, the conversion of glucose-6-phosphate to fructose
1,6-bisphosphate, which is controlled by phosphofructokinase, is
of key importance. So while glucose metabolism is negatively
regulated by phosphofructokinase, fructose can continuously
enter the glycolytic pathway. Therefore, fructose can
uncontrollably produce glucose, glycogen, lactate, and pyruvate,
providing both the glycerol and acyl portions of acyl-glycerol
molecules. These particular substrates, and the excess energy
flux due to unregulated fructose metabolism, promotes the overproduction of TG.
thanks,
Coach Hale
www.maxcondition.com
www.knowledgesummit.net
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