"Reference size," as determined by IOM, is based on median height and weight for ages up to age 18 years of age and median height and weight for that height to give a BMI of 21.5 for adult females.
What should my daily intake of calories be? Within a healthy, balanced diet, a man needs around 10,500kJ (2,500kcal) a day to maintain his weight. For a woman, that figure is around 8,400kJ (2,000kcal) a day. These values can vary depending on age, metabolism and levels of .
Minimum Daily Calorie intake. It is difficult to set absolute bottom calorie levels, because everyone has different body composition and activity levels. Health authorities do set some baselines – these are 1200 calories per day for women, and 1800 calories per day for men.
31 rows · Print this section Appendix 2. Estimated Calorie Needs per Day, by Age, Sex, and Physical .