2000
1000
only 500 KL
That depends on how many calories the person in question's body requires to stay alive, or their BMR (basal metabolic rate) which depends on age, sex and weight. If they need 3000 calories, they will need to eat 3000 calories to maintain their weight. If they need 4000 calories, they need 4000 calories to maintain their weight. In addition, if they eat more than their BMR, they will gain weight, if they eat less, they will lose weight. In theory, you can have 2 totally different people who weight 800 pounds, BUT they each require different amounts of calories to maintain their 800 pounds.
2000 m 1700 f
In order to lose 1 pound, you need to burn 3,500 calories.
1500 calories is the average adult diet, that's for people above 13
No, you are not the only person alive. There are billions of people on Earth.
A climber on Mount Everest can burn anything between 6,000 and 10,000 calories in a single day, on summit day this will increase to around 20,000 calories.
About 2,000 calories or so.
It all depends on you body and how much exericse you are doing. If you consume that many calories (which, for the average person, is considered "dieting"), you need to exercsie to burn off calories to lose weight.
You can't lose weight by guessing. You will need to know how many calories you need per day by the amount of exercise you do. The average person burns 2000 calories per day. In order to maintain homeostasis within the body, your intake of calories should match how many calories you burn.