(Recommended Allowances For Energy For Indians, I.C.M.R., 1981)
The energy requirements of individuals are influenced by the following factors:
Body size and composition
Climate and other ecological factors.
Infants The energy requirements of infants during the first 6 months of life can be estimated from the observed intakes of breast milk by healthy infants from healthy mothers. An intake of 850 ml of human milk per day will provide on an average 120 Kcal per day during the first 3 months. From the 3rd month to 6th month, the energy intake from breast milk is slightly less. After 6 months of age, the quantity of breast milk secreted will be inadequate to meet the energy needs of the infant. The average energy requirements of the infant are as follows.
Reference Man He is between 20 and 39 years of age and weighs 55 kg. He is free from diseases and physically fit for active work. On each working day, he is employed for 8 hours in an occupation that usually involves moderate activity. When not at work, he spends 8 hours in bed, 4-6 hours sitting and moving around and two hours in walking in active recreation or in household duties.
Reference Woman She is between 20 and 39 year of age, healthy and weighs 45 kgs. She may be engaged for 8 hours in general household work, in light industry, or in other moderately active work. Apart from 8 hours in bed, she spends 4-6 hours sitting or moving around in only through light activity and 2 hours in walking, in active recreation or in household duties.
Effect of Physical Activity on Energy Requirement:
During pregnancy and lactation The ICMR Committee recommended an additional allowance for the entire pregnancy distributed as follows: (i) 300 Kcal/day in the 2nd and 3rd trimester of pregnancy and (ii) The Committee has estimated the additional requirements, during the first 6 months of lactation as 550 Kcal per day and 7-12 months of lactation 400 Kcal per day.