Final answer:
Adults aged 51 to 70, who engage in minimal outdoor activity, need 400-800 micrograms of vitamin D daily. Vitamin D can be obtained from sunlight exposure as well as from dietary sources such as cod liver oil, fish liver oil, egg yolk, milk, and animal liver. For those who do not get enough sunlight or consume enough vitamin D-rich foods, a vitamin D supplement can be prescribed by a doctor.
Step-by-step explanation:
Adults aged 51 to 70, who engage in minimal outdoor activity, need 400-800 micrograms of vitamin D daily. Vitamin D can be obtained from sunlight exposure as well as from dietary sources such as cod liver oil, fish liver oil, egg yolk, milk, and animal liver. For those who do not get enough sunlight or consume enough vitamin D-rich foods, a vitamin D supplement can be prescribed by a doctor.