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Fasting
Wasted youth, or selective muscle loss?
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<blockquote data-quote="first14808" data-source="post: 1923193" data-attributes="member: 452612"><p>Or at all.. </p><p></p><p></p><p></p><p>Agreed, although glucose may be something of a red herring given lipids being a bigger energy source. So the need for circulating glucose is typically low, and can be substituted with ketone bodies. </p><p></p><p>I think you're right about potential measurement error. So the typical body composition monitors like my Tanita scales work via resistance/impedance and then assumptions for composition. The multi-sensor ones that can sweep limbs and cores probably give better interpretations, but there's a lot of physiology involved. So like you say, Krebs and hydrating/dehydrating lipids for fat storage and release. </p><p></p><p>I guess one fundamental difference is nitrogen. So proteins have it, carbohydrates don't, and the body's pretty good at recycling old cells.. Or in extreme and dangerous cases, rhabdomyolysis where there's rapid muscle breakdown. Dehydration and loss of electrolytes from extreme starvation I suspect is a less extreme form of that, with similar symptoms, ie dark urine from breakdown products.</p></blockquote><p></p>
[QUOTE="first14808, post: 1923193, member: 452612"] Or at all.. Agreed, although glucose may be something of a red herring given lipids being a bigger energy source. So the need for circulating glucose is typically low, and can be substituted with ketone bodies. I think you're right about potential measurement error. So the typical body composition monitors like my Tanita scales work via resistance/impedance and then assumptions for composition. The multi-sensor ones that can sweep limbs and cores probably give better interpretations, but there's a lot of physiology involved. So like you say, Krebs and hydrating/dehydrating lipids for fat storage and release. I guess one fundamental difference is nitrogen. So proteins have it, carbohydrates don't, and the body's pretty good at recycling old cells.. Or in extreme and dangerous cases, rhabdomyolysis where there's rapid muscle breakdown. Dehydration and loss of electrolytes from extreme starvation I suspect is a less extreme form of that, with similar symptoms, ie dark urine from breakdown products. [/QUOTE]
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