
Tue, May-31-05, 17:23
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Re: If i lower my calorie intake, I will maintain or lose weight, right?
Tipster wrote:
> Forgive me if I sound stupid but
>
> As long as I eat the same amount (or less) then the calorie
> I use up, I should be able to stay off obesity, am I right?
>
> As far as weight gain is concerend, It shouldnt matter how
> much/what kind of carbohydrate, protein, or fat I'm
> consuming as long as its equal to or below my calorie
> expenditure, right?
>
> I'm not talking about cancer, heart dieseas, or diabetes,
> just weight gain.
>
> Any feeback will be appreciated.
http://www.nutritionj.com/cont=ADent/3/1/9
Abstract
The principle of "a calorie is a calorie," that weight change
in hypocaloric diets is independent of macronutrient
composition, is widely held in the popular and technical
literature, and is frequently justified by appeal to the laws
of thermodynamics. We review here some aspects of
thermodynamics that bear on weight loss and the effect of
macronutrient composition. The focus is the so-called
metabolic advantage in low-carbohydrate diets - greater weight
loss compared to isocaloric diets of different composition.
Two laws of thermodynamics are relevant to the systems
considered in nutrition and, whereas the first law is a
conservation (of energy) law, the second is a dissipation law:
something (negative entropy) is lost and therefore balance is
not to be expected in diet interventions. Here, we propose
that a misunderstanding of the second law accounts for the
controversy about the role of macronutrient effect on weight
loss and we review some aspects of elementary thermodynamics.
We use data in the literature to show that thermogenesis is
sufficient to predict metabolic advantage. Whereas homeostasis
ensures balance under many conditions, as a general principle,
"a calorie is a calorie" violates the second law of
thermodynamics.=20
**********=20
TC
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