It varies per food. And calories began to be absirbed with some foods, especially those easily broken down and liquids, within minutes of eating it.
I read somewhere that some calories will be absorbed. You have to eliminate the food before it hits the intestinal tract. I'm looking for the same answers. How fast do you need to eliminate the food before any calories are absorbed. Usually within 30 minutes. It's not a good idea to do this. By being bulimic you can have malnutrition and dehydration which can lead to electrolyte imbalances and heart arrhythmias.
NO
There are many variables that affect the answer. Variables such as how fast your body uses calories. I would estimate about 200-300 calories.
calories
Eat less and exercise more. Eliminate unhealthy food, drink water, and count calories. http://www.webmd.com/diet/guide/lose-weight-fast-how-to-do-it-safely?page=2
By exercising and staying active.
It depends what they dooooooo
Water exercise
...your metabolic rate.
How fast you can burn calories
Basically, yes. IF you get your heart rat up you will use more calories.
Because fast foods are high on calories and fat.