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Depends on how hard you work. Man hauling a sledge in the Antarctic, you'll need 4000 to 8 000 calories per day, and of that, at least 40% fat.
Ordinary folk get by with a few thousand calories per day, but if you are a blacksmith or a quarry worker, you might need 2000 to 4000 calories.
If you have less than 1500 cal you are unlikely to put on weight; less than 1000, you'll start to starve.
Your body is about 20% efficient in converting food calories into energy.
[As measured in rowing machine tests, where energy output and calorie consumption may easily be measured.]
Remember, the 'food calorie' is 1000 times that of the 'scientific calorie' which is the amount of heat needed to raise 1ml of water by 1oC.
NOTE: (added by bruce) It's my understanding that human body can absorb approximately 300 food-calories an hour or 7200 calories a day, assuming optimal conditions and variations among individuals, of course. Interesting tidbit; I have heard that athletes like M. Phelps, and riders in the Tour de France are incapable of restoring the calories they burn daily. They actually need time off to catch up. I'd be interested to know more about this myself.
What else can I help you with?
What nutrient doesn't supply calories to the human body?
The Nutrient That Doesn't supply calories to the human body is the water.......
Will the human body absorb a bone in the throat?
no
How many calories need in human body?
On average, 2000 calories per day.
How fast does your body absorb Gatorade?
2 hours fast
What is the most abundant and least expensive source of calories in the human body?
The most abundant source of calories in the human body is glycogen, which is stored in the liver and muscles, while the least expensive source of calories is body fat, which is used as a reserve energy source.
How much energy does protein provide in the human body?
Protein provides 4 calories of energy per gram in the human body.
Do you run out of energy?
Only if you die. Calories are converted into energy. The human body wouldn't survive with 0 calories in it.
How many calories are in wood?
Wood itself does not contain calories because it is not a food source that can be digested by the human body.
Can the human body digest calories in fruit?
Yes. There is no difference between the calories in fruit and in other foods. Most calories in fruits come from Sugars.
If you purge after eating something how much calories are already absorbed and how much can you get rid of by purging?
It all really depends on how long you wait with food in your body before purging. It takes 1 to 4 hours for food to move past your stomach. You do not absorb nutrients or calories until your small intestine.
Do pearls absorb your body heat?
Pearls are sensitive to temperature changes but they do not absorb body heat like a human body would. However, pearls can adapt to body temperature when worn against the skin.
How many calories equals a pound?
3500 calories need to be burned for a human to lose one pound of body fat.
