The need for calories varies by gender and age. An adult female has a daily recommendation of 1500-1600 kcal, while for men the recommendation is between 1800-1900 kcal per day. These numbers reflect the energy required for the body to breathe, digest, and continue cardiovascular functions. Sports people normally use 3500-4000 kcal energy daily. Calculating your daily Resting Metabolic Rate (kcal/day): Age (year) For men For women 10-17 17,5 X w + 651 12,2 X w + 746 18-29 15,3 X w + 679 14,7 X w + 496 30-59 11,6 X w + 879 8,7 X w + 829 60+ 13,5 X w + 487 10,5 X w + 596 w = weight in kilogram Source:...