A human being continually produces about about 7.0x10 watts or 0.070 kW (7.0x10 joules per sec) of heat.?

Question

How many calories would be produced in one day?

How many dietary calories is this?

Answer 1

6048000 joules = 1446890 calories (divide by 4.18). The dietary calorie or Calorie is actually a kcal (1000 calories), therefore your answer is 1447 Calories. You've got to eat more than this to take on board energy that is not given out as heat but does useful work. Also, the body is not a 100% efficient engine.