Power
What is your average power output per day?
If you eat 2000 Calories per day, (and assuming you do not gain or lose weight), that energy must be converted into energy you use throughout the day.
P = 2,000 Calories / day = (2000 Cal)*(4186 joule/Cal) / [(24 hours)*(60 min/hr)*(60 sec/min)] = 97 Watts.