Physiological models of body composition and human obesity

Nutrition & Metabolism

Table 10 Body composition of standard male and female.

Sex	Tissue	Reference body composition			Extra body composition
		Wt. Fr.	Fat Fr.	Density	Wt. Fr.	Fat. Fr.	Density
Male	Bone	0.151	0	1.4	0.0427	0	1.4
	Muscle	0.49	0	1.04	0.200	0	1.04
	Adipose	0.136	0.8	0.92	0.758	0.85	0.915
	Other	0.223	0	1.059	0	0	0
	Total	1	0.109	1.0667	1	0.644	0.952
Female	Bone	0.14	0	1.4	0.0367	0	1.4
	Muscle	0.395	0	1.04	0.0974	0	1.04
	Adipose	0.241	0.8	0.92	0.865	0.85	0.915
	Other	0.223	0	1.059	0	0	0
	Total	1	0.193	1.049	1	0.736	0.938

The body weight fraction (Wt. Fr.), the fraction of fat in each tissue (Fat Fr.) and the density of the body tissues are listed for the lean "Reference" subject and for the "Extra" weight associated with the additional fat in obese subjects. The composition is adjusted to be consistent with the experimental values of f₀, f₁, d₀ and d₁ (male: f₀ = .109; f₁ = .644; d₀ = 1.0667; d₁ = .952; female: f₀ = .193; f₁ = .736; d₀ = 1.049; d₁ = .938; see Table 8). The "Reference" adipose weight fraction = f₀/("Reference" adipose fat fr) and the "Extra" adipose weight fraction = f₁/("Extra" adipose fat fr). The reference bone and muscle weight fraction is derived from the values listed for the reference man [29] adjusted to give the observed male and female values of f₀. The weight fraction and density of the "Other" tissue was assumed to be the same in males and females. The adipose density is based on a density of 0.9007 for fat and 1.00625 for the adipose non-fat. The density of "other" was adjusted to give the observed d₀. The "Extra" bone, muscle and adipose weight fractions are uniquely determined by the values of f₁ and d₁.

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