How many calories does the human body normally burn in day to day activities?

Depends : It depends on age, sex, weight, height, muscle mass. On average, for a woman 1000 calories for the first 5 feet in height, plus 50 calories for every inch above that, plus 10% if you're sedentary. So that 2000 calorie diet they put on nutrition labels? Only good if you are a 5'8" man with a physical job and weigh 170 pounds.

Varies...: ...By weight, diet, genetics and activity. Studies have shown values from 1000-2500 kcals/day. Exercise daily, eat multiple small meals per day, are easy ways to boost your metabolism.Try eating nuts, fruits veggies, brown rice, whole grains, coffee, black or green tea, chocolate, cinnamon, ginger, pepper, garlic, cloves, mustard.