Nutrition and Diet Flashcards
Define ‘diet’.
The type and amount of food and drinks that a person consumes regularly.
What are individual dietary recommendations based on?
Age
* Gender
* Physiological status (such as pregnancy)
* Weight/Height
* Physical activity
* Health status etc.
What are dietary reference values (DRVs)?
A set of estimated nutrient requirements for healthy populations in the UK.
What are DRVs used for?
To inform public health policies, food labelling, and
dietary advice given by healthcare professionals.
Define Reference Nutrient Intakes (RNI).
Levels of nutrients that are sufficient to meet the needs of almost all (97.5%) individuals in the population.
Define Estimated Average Requirements (EAR).
Levels of nutrients that are estimated to meet the needs of half of the population.
Define Lower Reference Nutrient Intakes (LRNI).
Levels of nutrients that are sufficient for only a small
percentage of the population (2.5%).
Define ‘Safe Intake’.
Level of nutrients that is considered safe for most people to consume.
What are the public health reasons for measuring people’s diets?
- To evaluate/monitor the adequacy of people’s diets (nationally or locally)
- To evaluate/monitor a dietary improvement programme
What are the research reasons for measuring people’s diets?
To identify any relationships between diet and health, wellbeing or disease using large population
studies.
What are the clinical reasons for measuring people’s diets?
To help diagnose a diet-related condition.
What are the commercial/economic reasons for measuring people’s diets?
To assess consumer choice of foods
List the 2 approaches to measuring diet and nutrition.
- Measure dietary intake
- Measure nutritional status
How do you measure nutritional status ?
Using biomarkers via blood, urine etc.
What is the purpose of measuring dietary intake?
Evaluate type and quantity of foods consumed and
identify levels of nutrient intakes.
What is the purpose of measuring nutritional status?
To identify the levels of a nutrient in a person’s body.
Give an example of a direct method of measuring diet and nutrition.
Directly measure food intake by individuals (can be
households).
Give an example of an indirect method of measuring diet and nutrition.
Estimate intake by using information on food
availability (can be at national, regional or household level (not individual).
Define ‘biomarker’.
Substance found in the body that can be used to measure physiological processes and reflect changes in a person’s health status.
Give two examples of biomarkers.
- Blood levels of vitamin D
- Urine to measure sodium
Give examples of objective methods to assess dietary intakes.
Direct observation, duplicated diets (biomarkers)
Give examples of subjective methods to assess dietary intakes.
- Weighed food diaries
- 24 hour recall
- Food frequency questionnaire
List a few strengths of prospective food diaries.
- Provides detailed descriptions of all foods and drinks.
- Food / drink recorded at time of consumption, so no recall error.
- If weighed, portion sizes exact.
- All eating occasions covered.
- Good for capturing foods eaten frequently
- Excellent estimates multiple levels; for energy, nutrients, food and food groups and overall diet.
List a few weaknesses of prospective food diaries.
- Can be time consuming and labour intensive. Very costly in staff time.
- Large respondent burden - individuals must be
motivated, compliant, numerate and literate. - The individual may alter his/her diet to make it easier to record. Intake recorded may not be ‘typical’ diet.
- Weighing food eaten away from home can be difficult
- Foods eaten less than once or twice a week may not be
captured. - If 7 days, recording can become less accurate towards
the end of the period because of study fatigue.