World hunger is a terrible symptom of world poverty. If efforts are only directed at providing food, or improving food production or distribution, then the structural root causes that create hunger, poverty and dependency would still remain. 1 billion children live in poverty (1 in 2 children in the world). 2  640 million live without adequate shelter, 400 million have no access to safe water, 270 million have no access to health services. 10.6 million died in 2003 before they reached the age of 5 (or roughly 29,000 children per day).
A catalyst is a substance which speeds up a reaction, but is chemically unchanged at the end of the reaction. When the reaction has finished, you would have exactly the same mass of catalyst as you had at the beginning.
An enzyme is a catalyst; it has all the parts for the reaction on it and help organic materials break down or transfer energy or whatever reaction it needs. Catalysts (including enzymes) work by lowering the activation energy of a reaction so that more reactants can be converted to products. They are not used up themselves in the reaction and do not affect the equilibrium. They only speed up the rate at which equilibrium is achieved.