Table 1.

Tissue and organ basal mass-specific metabolic rates (kcal/kg/d) and density^*.

Organ/Tissue	Young non-obese adult	Young obese adult	Older Adult Non-obese+	Density (g/cm3)
Brain	240	232.8	235.2	1.03
Heart	440	426.8	431.2	1.03
Liver	200	194.0	196.0	1.05
Kidneys	440	426.8	431.2	1.05
SM	13	12.6	12.7	1.04
AT	4.5	4.4	4.4	0.92
Residual	12	11.6	11.8	++

^*From^{50, 64–66, 69}

⁺age >50 yrs

⁺⁺Residual mass is not assigned a density but is calculated as body mass minus the sum of other measured mass components.

Abbreviations: AT, adipose tissue; SM, skeletal muscle.