Lecture 8: Portion Size Estimation Flashcards
What is portion size?
The amount of food that is actually eaten within a defined eating episode
What is happening to portion sizes over time?
They are increasing (e.g. supersized options available) - obesity epidemic
What happens to enviornmental cues with age?
They come into play more e.g. 5-6 year olds will eat more when given more whereas 3-4 year olds will eat the same amount
Does offering larger portion size effect energy intake?
Yes
What are the four steps to dietary assessment?
- Measure food intake
- Convert foods to nutrients
- Estimate absorbed intake of nutrients
- Evaluate dietary adequacy
What does measuring food intake require?
Appropriate method and tool for population, measurement aids.
What does converting foods to nutrients require?
Density factors: mLs to grams
What does evaluating dietary adequacy require?
Reference values for age and sex groups
What are sources of error in dietary assessment?
- Memory/recall
- Incorrect use of portion size tools (interviewer)
- Quantification skills of respondent
- Density factors
What is the 1 cup diet phenomenon?
Cups come in lots of different sizes: People get quite burdened with thinking about exactly how much they have had
What are the cognitive processes of a diet recall?
- Perception - amount in relation to aid
- Conceptualisation - amount not present
- Memory
- Social desirability
Who are more likely to underreport?
Women and overweight people
What factors influence the accuracy of portion size estimation?
- Dietary Assessment Method
- Type of food
- Respondent Characteristics
What do you need to look at when recalling a recipe?
- Ingredients
- Quantities
- Yield before and after cooking
- % consumed
What type of food is really easy to recall?
Pre-portioned food e.g. weet-bix
