Caloric intake varies for each person based on age, gender, and activity level, but for the most part, women between 23 and 50 should eat about 2,200 calories per day to maintain their current weight, while older women need fewer calories. The FDA recommends that everyone maintain healthy levels of fat and fiber intake through out their adult lives. The words obesity and overweight are generally used interchangeably. However, according to the Institute of Medicine report, their technical meanings are not identical. Overweight refers to an excess of body weight that includes all tissues, such as fat, bone and muscle.
Obesity refers specifically to an excess of body fat.
It is possible to be overweight without being obese, as in the case of a body builder who has a substantial amount of muscle mass. It is possible to be obese without being overweight, as in the case of a very sedentary person who is within the desirable weight range but who nevertheless has an excess of body fat. However, most overweight people are also obese and vice versa. Men with more than 25 percent and women with more than 30 percent body fat are considered obese. Your personal 'fat allowance' depends on how many calories you take in each day.