Why is body fat less dense than both HDL and LDL densities?

Question

LDL density is anywhere from 1.01 to 1.05 g/cm^3, HDL density is anywhere from 1.08 g/cm^3 to 1.21 g/cm^3, so why is body fat usually listed as somewhere between .90 and .92 g/cm^3?

Answer 1

HDL & LDL are like 'fat storage capsules' used for transporting cholesterol & lipids in the body. They are surrounded by a phospholipid membrane with integrated apolipoproteins for stability. The middle contains different proportions of esterified cholesterol & free fatty acids.
The difference with body fat is that it is mainly free fatty acids and not much cholesterol. In a manner of speaking, it is not 'stuffed' as tightly as the smaller lipoproteins HDL & LDL.

Answer 2

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