RD Exam Practice Questions 2026 – Study Guide and Review Material
Which of the following was used when calculating estimated energy needs presented in the US
Dietary Guidelines?
a) Ideal weight
b) Reference weight
c) Healthy weight per body mass index
d) Measured weight - correct answer ✔✔ b) Reference weight
Estimated energy needs presented in the DGA were based on estimated energy requirement
(EER) equations using reference heights (average) and reference weights (healthy) for each age-
sex group.
According to which system would a soup made of thin broth and 1.2-cm soft carrot cubes be
classified as "6-0"?
a) EAL grading
b) encpt coding
c) ICD-10 coding
d) IDDSI framework - correct answer ✔✔ c) IDDSI framework
Per the International Dysphagia Diet Standardisation Initiative, or IDDSI, it is necessary to
characterize both the liquid and the solid components of dual-consistency foods to ensure they
are appropriate for a given patient.
The IDDSI testing methods can be used to describe the texture of a dual-consistency food by
separating the components. A soup with 1.2 cm sized cubes of carrot floating in a broth would
,be classified as 6-0 because the food (carrots) are Level 6 - soft and bite-sized and the liquid
(broth) is Level 0 - thin.
This enzyme found in the kidney is needed for the conversion of 25-hydroxyvitamin D3 to the
active form.
a) 25-hydroxylase
b) 24-hydroxylase
c) 1-hydroxylase
d) 22-hydroxylase - correct answer ✔✔ c) 1-hydroxylase
The 1-hydroxylase enzyme is found in highest concentrations in the kidneys and is responsible
for converting 25-hydroxyvitamin D3 to 1,25-dihydroxyvitamin D (its active form).
25-hydroxylase is the enzyme responsible for the first required hydroxylation of D3 and is found
in the liver.
24-hydroxylase is responsible for the breakdown of the vitamin.
Which of the following foods should be limited in women taking tamoxifen?
a) Tofu
b) Edamame
c) Chickpeas
d) Grapefruit juice - correct answer ✔✔ d) Grapefruit juice
Grapefruit is known for interfering with a host of medications, including tamoxifen. Meanwhile,
there is a lot of misinformation regarding soy and estrogens. Though there are concerns
,regarding "phytoestrogens" in soy foods that have led to recommendations that women who
take tamoxifen should avoid soy foods (the hypothesis is that these foods could negate the
medication's estrogen-blocking effects), research demonstrates that soy foods appear to
enhance or improve tamoxifen's breast cancer-blocking actions.
Which of the following statements is true with regard to NPIs (national provider identifiers)?
a) NPI requirements are no longer applicable if a billing agency is responsible for transactions
b) NPI numbers change if an RDN moves from one state to another
c) If an NPI isn't used within 12 months, it is automatically deactivated
d) Individual practitioners who don't meet HIPAA coverage criteria may still need an NPI -
correct answer ✔✔ d) Individual practitioners who don't meet HIPAA coverage criteria may still
need an NPI
The NPI is a unique, 10-digit number that identifies a health care provider; the NPI is specific to
an individual and doesn't change. An EIN number is separate from an NPI and used for tax
purposes but is still important if an RDN is working in private practice.
All health care providers (individuals or organizations) who are HIPAA-covered entities are
required by law to obtain an NPI when transmitting electronic health information in connection
with HIPAA standard transactions, even if the transaction is prepared by a third-party billing
agency.
And some individuals who don't meet HIPAA coverage criteria may still be required to obtain an
NPI. RDNs who work in a private practice setting need to have these specific numbers to assist
with "credentialing" or becoming a recognized health care provider of an insurance plan. The
Academy encourages all members to obtain an NPI to ensure there are adequate numbers of
RDNs who can provide service.
What is the age range when weight and body mass index peak?
, a) 30-39 years
b) 40-49 years
c) 50-59 years
d) 60-69 years - correct answer ✔✔ c) 50-59 years
Weight and BMI peak between age 50 and 59 years, then stabilize and start slowly dropping
around age 70.
Which of the following is true of the IDDSI Level 7 Regular (Black) diet?
a) Crunchy and hard foods are the only restriction
b) There are no restrictions on allowable foods
c) Mixed-consistency foods are permitted for adult patients only
d) Food particle size is the only restriction - correct answer ✔✔ b) There are no restrictions on
allowable foods
The Level 7 Regular (Black) diet of the International Dysphagia Diet Standardisation Initiative is
not a texture-modified diet and therefore there are no restrictions on allowable foods on this
diet.
Which of the following is a malnutrition diagnosis in Nutrition Care Process terminology?
a) New-onset illness malnutrition
b) Acute disease or condition-related malnutrition
c) Nutrient deficiency-related malnutrition
d) Chronic disease or condition-related malnutrition - correct answer ✔✔ d) Chronic disease or
condition-related malnutrition
Which of the following was used when calculating estimated energy needs presented in the US
Dietary Guidelines?
a) Ideal weight
b) Reference weight
c) Healthy weight per body mass index
d) Measured weight - correct answer ✔✔ b) Reference weight
Estimated energy needs presented in the DGA were based on estimated energy requirement
(EER) equations using reference heights (average) and reference weights (healthy) for each age-
sex group.
According to which system would a soup made of thin broth and 1.2-cm soft carrot cubes be
classified as "6-0"?
a) EAL grading
b) encpt coding
c) ICD-10 coding
d) IDDSI framework - correct answer ✔✔ c) IDDSI framework
Per the International Dysphagia Diet Standardisation Initiative, or IDDSI, it is necessary to
characterize both the liquid and the solid components of dual-consistency foods to ensure they
are appropriate for a given patient.
The IDDSI testing methods can be used to describe the texture of a dual-consistency food by
separating the components. A soup with 1.2 cm sized cubes of carrot floating in a broth would
,be classified as 6-0 because the food (carrots) are Level 6 - soft and bite-sized and the liquid
(broth) is Level 0 - thin.
This enzyme found in the kidney is needed for the conversion of 25-hydroxyvitamin D3 to the
active form.
a) 25-hydroxylase
b) 24-hydroxylase
c) 1-hydroxylase
d) 22-hydroxylase - correct answer ✔✔ c) 1-hydroxylase
The 1-hydroxylase enzyme is found in highest concentrations in the kidneys and is responsible
for converting 25-hydroxyvitamin D3 to 1,25-dihydroxyvitamin D (its active form).
25-hydroxylase is the enzyme responsible for the first required hydroxylation of D3 and is found
in the liver.
24-hydroxylase is responsible for the breakdown of the vitamin.
Which of the following foods should be limited in women taking tamoxifen?
a) Tofu
b) Edamame
c) Chickpeas
d) Grapefruit juice - correct answer ✔✔ d) Grapefruit juice
Grapefruit is known for interfering with a host of medications, including tamoxifen. Meanwhile,
there is a lot of misinformation regarding soy and estrogens. Though there are concerns
,regarding "phytoestrogens" in soy foods that have led to recommendations that women who
take tamoxifen should avoid soy foods (the hypothesis is that these foods could negate the
medication's estrogen-blocking effects), research demonstrates that soy foods appear to
enhance or improve tamoxifen's breast cancer-blocking actions.
Which of the following statements is true with regard to NPIs (national provider identifiers)?
a) NPI requirements are no longer applicable if a billing agency is responsible for transactions
b) NPI numbers change if an RDN moves from one state to another
c) If an NPI isn't used within 12 months, it is automatically deactivated
d) Individual practitioners who don't meet HIPAA coverage criteria may still need an NPI -
correct answer ✔✔ d) Individual practitioners who don't meet HIPAA coverage criteria may still
need an NPI
The NPI is a unique, 10-digit number that identifies a health care provider; the NPI is specific to
an individual and doesn't change. An EIN number is separate from an NPI and used for tax
purposes but is still important if an RDN is working in private practice.
All health care providers (individuals or organizations) who are HIPAA-covered entities are
required by law to obtain an NPI when transmitting electronic health information in connection
with HIPAA standard transactions, even if the transaction is prepared by a third-party billing
agency.
And some individuals who don't meet HIPAA coverage criteria may still be required to obtain an
NPI. RDNs who work in a private practice setting need to have these specific numbers to assist
with "credentialing" or becoming a recognized health care provider of an insurance plan. The
Academy encourages all members to obtain an NPI to ensure there are adequate numbers of
RDNs who can provide service.
What is the age range when weight and body mass index peak?
, a) 30-39 years
b) 40-49 years
c) 50-59 years
d) 60-69 years - correct answer ✔✔ c) 50-59 years
Weight and BMI peak between age 50 and 59 years, then stabilize and start slowly dropping
around age 70.
Which of the following is true of the IDDSI Level 7 Regular (Black) diet?
a) Crunchy and hard foods are the only restriction
b) There are no restrictions on allowable foods
c) Mixed-consistency foods are permitted for adult patients only
d) Food particle size is the only restriction - correct answer ✔✔ b) There are no restrictions on
allowable foods
The Level 7 Regular (Black) diet of the International Dysphagia Diet Standardisation Initiative is
not a texture-modified diet and therefore there are no restrictions on allowable foods on this
diet.
Which of the following is a malnutrition diagnosis in Nutrition Care Process terminology?
a) New-onset illness malnutrition
b) Acute disease or condition-related malnutrition
c) Nutrient deficiency-related malnutrition
d) Chronic disease or condition-related malnutrition - correct answer ✔✔ d) Chronic disease or
condition-related malnutrition
