Originally Posted by
DaHaMac
"Both kilojoules and calories are measures of energy. Kilojoules is part of the metric system as used in Australia but not in some other countries such as the US. One calorie (a capital "C" actually refers to "kilocalorie") equals 4.2 kilojoules/kJ."
True but the body is about 25% efficient. So if you burn 1000 kJ, then you need to eat about 1000C to remain at about a net zero.