Life Stage Change in Nutrient Needs
Pregnancy* Increased requirements: energy [27], protein, essential fatty acids, vitamin A, vitamin C, B–vitamins (B1, B2, B3, B5, B6, B12, folate, choline) & calcium, phosphorus**, magnesium, potassium, iron, zinc, copper, chromium, selenium, iodine, manganese, molybdenum
Lactation* Increased requirements: vitamins A, C, E, all B–vitamins, sodium, magnesium**
Decreased requirements: iron
Infancy, childhood* Increased requirements: energy, protein, essential fatty acids
Adolescence* Increased requirements: energy, protein, calcium, phosphorus, magnesium, zinc (females only)
Early adulthood (ages 19–50) Increased requirements for males compared with females:  vitamins C, K; B1, B2, B3, and choline; magnesium, zinc, chromium, manganese
Increased requirements for females compared with males: iron
Middle age (ages 51–70)* Increased requirements: vitamin B6, vitamin D
Elderly (age 70+)* Increased requirements: vitamin D
Decreased requirements: energy; iron (females only)
Table 1: The changes in daily requirements of nutrient needs according to age [26].