Table 1.

Daily water losses and production

Source	Loss (mL/day)	Production (mL/day)
Respiratory loss	−250 to –350
Urinary loss	−500 to –1000
Fecal loss	−100 to –200
Insensible loss	−450 to –1900
Metabolic production		+250 to +350a
Total	−1300 to −3450	+250 to +350
Net loss (sedentary)	−1050 to −3100
Sweat losses in various sports	−455 to −3630
Net loss (athlete)	−1550 to −6730

Adapted from Sawka et al. [12], with permission

^aMetabolic water production based on 2500–3000 kcal daily energy expenditure. Additional water production with exercise is assumed offset by parallel respiratory losses