The amounts of protein and energy needed per kilogram of body weight , whereas the total amount of protein and energy needed as children grow into adulthood.

decreases; increases

Explanation:

The nutrient needs  during the four main stages of the human are considerably very different.  infants and children  nutrient needs differs from what adults and the elderly need.

Infancy, childhood and adolescence are growth stages in humans that  is all these age groups are undergoing rapid growth and development and so requires  more nutrient.

Studies has shown that Energy needed by humans varies such  as Adult needs 25–30 calories per kg,  Infants of four to six months who weigh 6 kg require roughly 82 kilocalories per kg (490 calories/day). Children of one to three years require approximately 83 kilocalories per kg (990 calories/day) and also  energy needed by man decreases onward and are based on weight, height, and physical activity.