As we have a tendency to expend our own fat we tend to lose weight. To keep our weight steady we should eat the number of food, in terms of calories, that we have a tendency to would like and no additional.The amount of calories we have a tendency to would like varies with sex (as a general rule men would like more than ladies as a result of, on average, they are dditional active), with the work we do (manual work needs more calories than sedentary work), with age (we tend to need a lot of calories at twenty-5 than at sixty) and with the means we are made.