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.
1200
no
The Nutrient That Doesn't supply calories to the human body is the water.......
2 hours
2 hours fast
On average, 2000 calories per day.
the blood absorb oxygen in the lungs(cappilaries)
Uranium enter in the human body by ingestion or inhalation.
Only if you die. Calories are converted into energy. The human body wouldn't survive with 0 calories in it.
through the large intestine
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.
Potato contains simple carbohydrates that are easy to digest and absorb by the human body. One large potato which is around 300 gms in weight contains around 280 calories.
Yes. There is no difference between the calories in fruit and in other foods. Most calories in fruits come from Sugars.