RDN Lifecycle Nutrition 3

Question 1

Which nutrient supplementation during the periconceptional period (one month before through first trimester) most effectively reduces the risk of neural tube defects?

Accepted Answer

Folic acid 400–800 mcg/day

Answer

Folic acid 400–800 mcg/day taken before conception and through the first trimester significantly reduces the incidence of neural tube defects such as spina bifida.

Question 2

A postmenopausal woman's DEXA scan shows a T-score of −2.7. What is her diagnosis, and what calcium intake does she need daily?

Accepted Answer

Osteoporosis; 1200 mg/day

Answer

A T-score of −2.5 or below defines osteoporosis, and postmenopausal women require 1200 mg/day of calcium to support bone health.

Question 3

Which of the following is the most appropriate complementary food to introduce first to a 6-month-old exclusively breastfed infant?

Accepted Answer

Iron-fortified single-grain cereal or pureed meat

Answer

Iron-fortified cereals or pureed meats are recommended as first complementary foods to address the iron gap in exclusively breastfed infants at 6 months.

Question 4

An older adult (age 72) with limited sun exposure is assessed for nutritional risk. What is the current RDA for vitamin D for this individual?

Accepted Answer

800 IU (20 mcg)/day

Answer

Adults aged 71 and older have an RDA of 800 IU (20 mcg)/day for vitamin D, reflecting reduced cutaneous synthesis and higher risk of deficiency.

Question 5

A school-age child is diagnosed with iron-deficiency anemia. Which dietary strategy most effectively enhances non-heme iron absorption?

Accepted Answer

Consuming iron-rich foods with vitamin C sources

Answer

Vitamin C (ascorbic acid) converts ferric iron to the more absorbable ferrous form and chelates iron, significantly enhancing non-heme iron absorption.

(RDN) Registered Dietitian Nutritionist Practice Test

(RDN) Registered Dietitian Nutritionist Practice Test

RDN Lifecycle Nutrition 3