Factors affecting energy requirements in humans.
Age:. Infants, for instance, need a greater proportion of protein than adults.
Sex: males generally require more carbohydrates than females.The requirements of specific nutrients for females depends on the stage of development in the life cycle. Adolescent girls require more iron in their diet; expectant and nursing mothers require a lot of proteins and mineral salts.
State of Health: A sick individual requires more of certain nutrients e.g. proteins, than a healthy one.
Occupation: An office worker needs less nutrients than a manual worker.
Basal metabolic rate:The rate at which the body uses energy while at rest to maintain vital functions such as breathing and keeping warm.