Stupid calculation.

2,000 cal/day, if pure sugar, would be about 0.5 kg of sugar.

If we take a lifespan of 82+ years (30,000 days), then that would be 15,000 kg of sugar.

sucrose C_{12}H_{22}O_{11} 342.3 g/mol

15,000 kg sucrose = 43,821 mol

C_{12}H_{22}O_{11} + 12 O_{2} -> 12 CO_{2} + 11 H_{2}O

525,852 mol CO_{2} and 482,031 mol H_{2}O

55.346 mol in 1 liter of H_{2}O

A lifetime metabolism produces about 8,709 L of H_{2}O, about 20 m x 20 m x 20 m, or a little more than 12 Jacuzzis.