TABLE I.

Water formation by oxidation of storage substrates

	A	B	C	D	E	F	G
Substrates	Metabolic H2O in g/kJ of oxidized substratea	Energy in kJ/g substrate wet wt	Metabolic H2O in g/g fuel (A × B)	H2O content in g/g dry wt substrated	Energy in kJ/g dry wt	H2O content in g/kJ (D/E)	Total H2O in g/kJ (A + F)
Fat	0.0272	39.6e	1.08	0.20	39.6	0.005	0.032
Protein	0.0220	3.7b	0.08	3.65	18.4	0.198	0.220
Carbohydrate	0.0318	5.6c	0.18	2.10	17	0.124	5.632

^aValues for calculating metabolic water production from indirect respiration calorimetry (35).

^bAssuming that lean tissue contains approximately 73% water (12, 51).

^cAssuming that 2/3 of glycogen wet weight is water.

^dWater associated with electrolytes and hydration shells.

^eAssuming that fatty acids can be mobilized from adipose tissue without loss of tissue water.