little as 2000 calories, or as much as 2500 calories. daily diets for most folks will be in the range of 2000 calories to 2500 calories. this is on the average. so you can see that in this situation, there will not be any changes in the weight of this man or woman.
there is nothing tough here. let us say that you eat 2000 calories a day. so the equation is that you want to use up more than 2000 calories, in a day, or you could eat less than 2000 calories in one day. you could also do both of these. this really is not a lot of hard 