Desert animals have no drinking water, but they restrict water loss by the body and obtain water by metabolizing food. So do we! If we eat 100 g of sweets or cookies, made of glucose and fructose (C6H12O6), and we ‘burn them’ (metabolize them) in our cells the following reaction happens: C6H12O6 + 6 02 -> 6 CO2 + 6 H2O (+ energy) - How many grams of 02 do we need to take in via respiration to make the reaction possible? - We get rid of the CO2 via the lungs, but if we keep the water in our body. How many grams of water did we obtain from this food in the end?