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sorry to say this but at only 500 calories a day, i guarantee most of your loss on the scale is due to muscle loss....there is absolutely no way you kept your muscles and burned all fat on 500...that or you didn't actually stay at 500 and ate more.
im not trying to be an ass, im just letting you know eating that low is not a good idea
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Your right. It is a poor idea in most situations to eat so little on a daily basis. However, never will the
body call on protein as a greater substrate for
energy demands than it does lipids. The ratio of muscle to
fat loss may be greater than it would on a more reasonable deficient, but, never does it exceed
fat use.
The real danger to extreme skeletal muscle protein catabolism becomes more likely with longer term
dieting(4-5weeks+). The starting muscle loss is generally only around 3-5%. It can increase in later weeks/months upwards of 10%-20%, though. Large deficients, little physical activity, and poor diets are what allow this percentage to skyrocket.
Just a helpful FYI, Trev.
