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Measuring Undernutrition Chapter 4. From Chapter 3 What we Learned. Biggest problem, Over- & under-nutrition Total Calories Protein Micronutrients . Common methods of assessing undernutrition. Clinical Assessment : Looking for physical signs of nutritional disorders

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Measuring undernutrition chapter 4
Measuring UndernutritionChapter 4


From chapter 3 what we learned
From Chapter 3What we Learned

  • Biggest problem, Over- & under-nutrition

    • Total Calories

    • Protein

    • Micronutrients


Common methods of assessing undernutrition
Common methods of assessing undernutrition

  • Clinical Assessment: Looking for physical signs of nutritional disorders

  • Biochemical: Examine blood and urine looking for metabolic changes that accompany nutritional disorders


Common methods of assessing undernutrition cont
Common methods of assessing undernutrition (cont.)

  • Dietary Assessment: Track what the person eats

  • Anthropometric Assessment: Measuring the human body and its parts. It is the most common method of assessing nutritional disorders


Clinical assessment
Clinical Assessment

  • Look at:

    • Hair color (lighter and thinner)

    • Ankle swelling

    • Enlarged necks

    • Poor eye sight


Clinical assessment cont
Clinical Assessment (cont.)

  • What is each an indicator of?

    • Hair color (Lighter and thinner)

      • Protein deficiency

    • Ankle swelling

      • Protein deficiency causing circulation problems

    • Enlarged necks

      • Goiter, iodine deficiency

    • Poor eye sight

      • Vitamin A deficiency


Clinical assessment cont1
Clinical Assessment (cont.)

  • Be aware that other things can cause these symptoms

  • When these symptoms show to this extent then the problem is advanced

  • Used to analyze:

    • most severe cases

    • Specific types of malnutrition


Biochemical assessment
Biochemical Assessment

  • Blood and urine tests

  • Show micronutrient deficiencies

  • Accurate but relatively expensive


Dietary assessment
Dietary Assessment

  • 2 Methods:

    • Survey – recall by the person, after-the-fact

    • Review dietary records


Dietary assessment cont
Dietary Assessment (cont.)

  • Problems with both methods

    • People can’t recall exactly

    • People lie

    • People adjust their eating habits when they are in a study

    • Breast feeding – difficult to determine how much the baby eats

    • Seasonal variations (price & availability)


Dietary assessment1
Dietary Assessment

  • Useful in:

    • Doing comparisons of diet and income

    • Also useful to track food allocations within the family


Anthropometric assessment
Anthropometric Assessment

  • Most commonly-used method

  • Size – indicator of calories & protein intake


Anthropometric cont
Anthropometric (cont.)

  • Acute undernutrition

    • Short-term inadequate food

    • Caused by famine or war

    • People can recover

  • Chronic undernutrition

    • Long-term inadequate food

    • Even moderate, effects are permanent


Stunting
Stunting

  • Def.: low height-for-age

    • Shows that the person has experienced chronic undernutrition during growth years

    • It is a symptom of pastundernutrition


Stunting cont
Stunting (cont.)

  • People born in 1910 were 4 cm (1.6 in) shorter than those born in 1930

  • People born in 1950 1 cm (1/2 in) taller than those in 1930

    • What does that tell you?


Wasting
Wasting

  • Def.: low weight for height

  • This is a symptom of currentundernutrition


Under weight
Under weight

  • Def.: low weight for age

  • A symptom of presentundernutrition


What about inheritance
What about Inheritance?

  • Part of people’s height is determined by their genes

  • Are there ethnic differences?

  • These factors are less important than other factors

    • Nature vs. nurture


Other factors
Other Factors

  • Poverty

  • Poor food intake

  • Infectious & parasitic diseases

  • Other environmental factors


Use of antropometry
Use of Antropometry

  • Most useful in comparisons of infants

  • Older children, less so

  • In developed countries useful in measuring overnutrition of adults


Antropometry cont
Antropometry (cont.)

  • What is measured?

    • Height

    • Weight

    • Arm circumference

      • One of the better measures of fat in the body

    • Skin-fold thickness


Antropometry cont1
Antropometry (cont.)

  • Measurements are easy and cheap

  • Need:

    • Scale

    • Tape measure

    • Calipers (know what they are)


Antropometry cont2
Antropometry (cont.)

  • Training someone to recognize undernutrition by clinical means takes a lot more time

  • Comparisons to a Reference Group

    • “You are shorter than average”

    • “You weigh less than average”


What is the purpose of all this
What is the purpose of all this?

  • Identify those in need of help

    • Either those who are undernourished

    • Or Those who are overnourished


Method 1 measuring large groups
Method 1Measuring Large Groups

(Note: Method 1 is not labeled, but is described in the paragraph on p. 51 Drawing Inferences from a sample)

  • A continent?

  • A country?

  • A region?

  • Among demographic groups

    • Def: characteristics of a population or segment of the pop.

  • Among ethnic groups


Measuring cont
Measuring (cont.)

  • Cannot measure everyone

  • Statistics – Sampling

  • If our sample is representative then inferences can be made of the whole population


Method 2 examine aggregate data
Method 2Examine Aggregate Data

  • Look at data on:

    • Birth weight

    • Infant mortality

    • Morbidity

      • Def.: the rate of incidence of a disease

  • These are not direct measures of nutritional status


Method 3 aggregate nutrient intake
Method 3 Aggregate Nutrient Intake

  • Or: average nutrient intake

  • FAO keeps such data on each country

    • FAO Food and Agriculture Organization

      • Part of the UN

    • These food-balance sheets show sources and types of food – over 100 different foods


Aggregate cont
Aggregate (cont.)

  • FAO keeps stats on sources of food:

    • Beginning stocks

    • Production

    • Imports


Aggregate cont1
Aggregate (cont.)

  • FAO keeps stats on uses of food:

    • Ending stocks

    • Export

    • Animal feed

    • Consumption


Aggregate cont2
Aggregate (cont.)

  • They use the word balance sheet because sources and use are in balance


Aggregate data: These measures imply undernutrition in a region

  • High IMR

  • Low birth-weights

  • High morbidity (illness) rates


Look at food availability to infer the existence of undernutrition

Food balance sheets estimate human consumption

1. Add up the supply of a specific food

beginning stocks + production + imports


2. Subtract the amount used for:

exports + livestock feed + seed + ending stocks

What about food stocks used for fuel?

What is left can be assumed to go for human consumption


3. Convert this to calories

  • do for all foods, to calculate available calories per capita per day (a widely used measure of malnutrition)

    • Remember: Carbohydrate and protein has 4 calories/gram & Fats and oils have 9 calories/gram


This is a mean, it could be that some people are consuming above the average and some people are undernourished

a. Studies of individuals need to be done to infer the percentage of the population that have inadequate food intake


Iv undernutrition child health
IV. Undernutrition & child health

A. Undernourished mothers are likely to produce malnourished babies

1. Low birth weight

2. 40 times more likely to die before their first year


B. Undernutrition leads to high under-five mortality rates

Worldwide average (1999) = 78 per 1,000 live births

  • Industrialized countries = 7

    Developing countries = 85

  • Least developed countries = 161

    (Sub-Saharan Africa)


C. Undernutrition results in a weakened immune system which leads to death from childhood diseases

Infant mortality rate (IMR; children who die before their 1st birthday per 1,000 live births) goes up as a child’s percent of the median weight-for-age goes down


IMR in the U.S. is 2.1%

– before five = 2.5%

IMR in Guinea = 21.6%

– before five = 36.7%


V effects of undernutrition
V. Effects of undernutrition

A. Mental development impaired in undernourished children

B. Educational achievement lowered


C. Childhood undernutrition results in smaller adults who can do less physical work & who earn less money


D. Undernourished adults are less productive when working and lose more work time to sickness and so have less money to buy food

(note the cycle)


Measuring nutritional status for large groups
Measuring and lose more work time to sickness and so have less money to buy nutritional status for large groups

A. Draw inferences from a sample using statistics

1. Use info from a subset of the population to infer characteristics of the whole population

2. Sample must be representative


B. Use and lose more work time to sickness and so have less money to buy aggregate data on the effects of undernutrition to infer how much undernutrition exists

Aggregate data: data compiled from several measurements


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