Metrics and Tools in Food Environment Research · Metrics and Tools in Food Environment Research...
Transcript of Metrics and Tools in Food Environment Research · Metrics and Tools in Food Environment Research...
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Metrics and Tools in Food Environment Research
Anna Herforth, Djeinam Toure, Shauna Downs
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Agriculture-nutrition research would benefit from measuring food environments
• Predict/understand the likely effect of additional income on diets
• Monitor/evaluate the effect of the program on the food environment
• Design better nutrition-sensitive programs to fill supply and demand gaps based on understanding of the existing food environment
2
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Data on market food environments are lacking in low income countries (LMIC)• Limited data on informal market characteristics in LMIC
• Limited understating of how market food environments influence diet
• Measures that can help unpack these relationships are further lacking for LMIC
• “The paucity of evidence from high-quality studies is a severe limitation, highlighting the critical need for improved study designs and standardized methods and metrics.” (Turner et al. 2019)
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Food environment research in LMICs is slowly increasing
Turner et al. 2019, FE Research in LMICs, a systematic scoping review
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The geographic distribution of included articles across LMICs
Turner et al. 2019, FE Research in LMICs, a systematic scoping review
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Existing measures of the food environment
6
• Reviewed existing measures, and reviews of them• Bridging food environment research from HICs with global nutrition
• Hundreds of indicators/methods• The majority focus on geographical aspects of the food environment,
such as distance to food stores or restaurants
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Objective measures
7
• Mapping/GIS
• Presence and prices of diverse foods• Nutrition Environment Measures Survey for Stores (NEMS-S) checklist (Glanz
et al. 2007)
• Cost of Recommended Diet
• ProColor
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Subjective measures
• Greater perceived access to F&V was significantly associated with consumption (Caldwell et al. 2009)
• Perceptions of the food environment are more strongly correlated with diet than objective measures (several studies)
• Perceived Availability of Healthy Food Questions (Moore et al. 2008)
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Turner et al. 2018
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Turner et al. 2018
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An Emergent Measurement Framework for the Market Food
Environment in Low- and Middle-Income Countries
Djeinam Toure, Mduduzi N.N. Mbuya, Anna Herforth, Gretel Pelto, Lynnette M. Neufeld
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To identify:• (i) existing measures of the market food environment • (ii) domains represented in measures of the market food
environment • (iii) gaps in available measures of the market food
environment relative to domains represented by key frameworks of the food environment for LMIC
Research objective
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• Narrative review of the literature• 141 unique measures extracted from 18 papers
• Pile-sort of measures by 5 technical experts to identify measured domains
• Criteria for domains definition: measures with 80% agreement and conceptual fit
• Compared domains measured to domains from 3 conceptual frameworks of the food environment in LMIC1
Methods
1Herforth and Ahmed, 2015; Turner et al. 2018; FAO, 2016
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Overview of dendrogram of market food environment measures
80% agreement
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Simplified dendrogram of market food environment measures
Positioning of food stores (n=48)
Characteristics of foods in stores (n=93)
Objective measures of store availability (35)
Access to food store (13)
Foo
d s
tore
typ
e (4
)
Dis
tan
ce t
o f
oo
d s
tore
(9
)
Den
sity
of
foo
d s
tore
s (
13
)
Foo
d s
tore
wit
hin
wal
kin
g
(8)
Ph
ysic
al a
cce
ss (5
)
Tim
e to
acc
ess
fo
od
sto
re
(8)
Ease
of
foo
d a
cqu
isit
ion
in
NB
(6
)
Sto
re c
har
acte
rist
ics
(1)
Sele
ctio
n o
f fo
od
s in
NB
(3
)
Qu
alit
y o
f fo
od
s in
NB
(2
)
Sele
ctio
n o
f fo
od
s in
sto
res
(9)
Qu
alit
y o
f fo
od
s in
sto
res
(6)
Foo
d p
osi
tio
nin
g (5
)
Foo
d q
ual
ity
and
saf
ety
(5)
Pre
sen
ce o
f fo
od
it
em/b
aske
t (6
)
Var
iety
of
foo
d (
4)
Ad
vert
ise
men
t an
d
pro
mo
tio
n (4
)
Per
cep
tio
ns
of
foo
d c
ost
(7
)
Co
st a
s a
bar
rier
(5
)
Bar
rier
s to
hea
lth
y fo
od
ch
oic
e (4
)
Faci
litat
ors
to
hea
lth
y fo
od
ch
oic
e (7
)
Enco
ura
gem
ent
(3
)
Pri
ce (
7)
Per
cep
tio
ns
of
foo
d
insu
ffic
ien
cy (5
)
Ob
serv
ed n
utr
itio
n
mes
sagi
ng
(5)
Measures of the market food environment (n=141)
Objective availability of food in stores (24)
Price (7)
Factors affecting
food choice (14)
Perceived availability of food in neighborhood
(11)
Perceived affordability
(12)
Perceptions of food
insufficiency (5)
Observed nutrition
messaging (5)
Perceived availability of food in stores
(15)
Take-away 1: Two main clusters
Take-away 2: 10 measurement domains emerged
Take-away 3: Sub-categories help further describe what domains conceptually represent
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10 measured domains of the market food environment emerged
Objective measures of food store availability (n=35)
Objective availability of food in stores (n=24)
Observed nutrition messaging (n=5)
Food prices (n=7)
Perceived availability of foods in neighborhood (n=11)
Perceived availability of food in stores (n=15)
Affordability (n=12)
Access to food stores (n=13)
Perceptions of food insufficiency (n=5)
Factors affecting food choice (n=14)
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Measured domains of the market food environment
Objective measures of food store availability (n=35)
Food store type (5)Density of retail outlets (13)Distance to food store (9) Store characteristics (1)
Time of day open
Objective availability of food in stores (n=24)
Observed nutrition messaging (n=5)
Food prices (n=7)
DomainSub-domain (number of measures)
Illustrative measure
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Measured domains of the market food environment
Objective measures of food store availability (n=35)
Presence of a food item or basket (5)Food positioning (5)
Linear space devoted to a foodVariety of food (4)
Objective availability of food in stores (n=24)
Observed nutrition messaging (n=5)
Food prices (n=7)
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Measured domains of the market food environment
Objective measures of food store availability (n=35) I often buy food items that are located near the
register There are lots of signs and displays encouraging me
to buy the unhealthy foodsI see nutrition labels or nutrition information for
most packages
Objective availability of food in stores (n=24)
Observed nutrition messaging (n=5)
Food prices (n=7)
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Measured domains of the market food environment
Objective measures of food store availability (n=35)
Price of the most common item in a food category Price of the cheapest item in a food category Price of a food basketPrice per nutrient
Objective availability of food in stores (n=24)
Observed nutrition messaging (n=5)
Food prices (n=7)
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Measured domains of the market food environment
Ease of food acquisition (6)How easy or difficult is it for you to find fruits
and vegetables in your neighborhood?Selection of healthy foods (3)Quality of foods (2)
How would you rate the freshnessHow would you rate the quality
Perceived availability of foods in neighborhood (n=11)
Perceived availability of food in stores (n=15)
Affordability (n=12)
Access to food stores (n=13)
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Measured domains of the market food environment
Perceptions of food cost (7)How would you rate the price of [food]
Cost as a barrier to food purchase (5) I do not buy many fruits because they cost too
much
Perceived availability of foods in neighborhood (n=11)
Perceived availability of food in stores (n=15)
Affordability (n=12)
Access to food stores (n=13)
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Measured domains of the market food environment
Physical access to food store (5)Access to transport Ability to conduct shopping within walking
distance Time to access food stores (13)
Availability of childcare when buying food Availability of time as barrier for fruit
consumption
Perceived availability of foods in neighborhood (n=11)
Perceived availability of food in stores (n=15)
Affordability (n=12)
Access to food stores (n=13)
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Summary of findings • Eight domains measured in the market food environment
literature were identified • Objective and subjective (emic and etic) measures
consistent with conceptual frameworks for LMIC • Distinction between measures of the food
environment, personal factors that interact with the environment
• Gaps exist with regard to desirability, safety, convenience, and marketing
• Measures are almost entirely from high income country contexts
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Market food environment
Objective• Number, location, density and
proximity of food outlets in defined geographical areas
• Inventories of foods sold by food outlet type and associated metrics (NEMS-S, INFORMAS food retail & provision modules, etc)
• Ratio of shelf space allocated to specific types of foods (fruits and vegetables, ultra-processed foods etc) within stores
• Diversity inventories (e.g. ProColorDiversity Tool)
Perceived• Participatory social mapping of
consumers’ food environment
• Photo elicitation
• Perceptions of food availability
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Natural food environment
Objective
• Seasonal calendars of food production
• Transect and plot inventories with associated diversity metrics (e.g. Shannon diversity Modified Functional Attribute Diversity)
• Diversity inventories (e.g. ProColor Diversity Tool)
Perceived
• Photo elicitation
• Free listing of wild or cultivated food
• Perceptions of wild or cultivated food availability
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Market food environment
Objective
• Market surveys to assess food prices
• Cost of Diet tools
• Nutritious Food Price Index
Perceived
• Perceptions of food cost and affordability
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Cultivated food environment
Objective
• Expenses involved in agricultural production
• Market surveys to assess food prices
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Market food environment
Objective
• Time spent preparing foods
• Distance to markets and other food access points (GIS, travel time, etc.)
• Proportion of food purchased through online delivery (formal markets only)
Perceived
• Perceived convenience/ inconvenience of various food outlets and foods
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Natural food environment
Objective
• Time spent foraging or on food cultivation / rearing
• Time spent harvesting, processing and preparing foods for home use
Perceived
• Perceived convenience/inconvenience of wild gathering foods
• Perceived convenience/ inconvenience of home production of foods
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Market food environment
Objective• Promotion and placement of ultra-
processed vs fresh / minimally processed foods
• Presence of nutrition labeling/information at point-of-purchase
• Presence of marketing at point-of-purchase
• Food safety ratings of food outlets
• INFORMAS food promotion and labeling module
• Food quality (nutrient, mineral, and / or phytochemical composition such as Total Phenolic Concentration)
Perceived• Sensory surveys (e.g. ProDesirability
Tool)
• Exposure to food marketing
• Exposure to social marketing
• Exposure to food promotion through social media
Promotion & Quality
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Natural food environment
Objective
• Food quality (nutrient, mineral, and / or phytochemical composition such as Total Phenolic Concentration)
• Food safety (e.g., exposure to aflatoxin, food borne illness, toxicity)
Perceived
• Sensory surveys (e.g. ProDesirability Tool)
• Exposure to social marketing
Promotion & Quality
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Market food environment
Objective
• Carbon and water footprint of food purchased
• Non-CO2 GHGEs (i.e., N20, CH4) related to food purchased
• Local or seasonal procurement
• Contaminants or residues present in food purchased
• Food losses and waste
• Use of packaging
Perceived
• Awareness of labels such as “organic”, “local”, “IPM”, “free range”, “fair trade”, product origin, etc.
• Awareness of product origin
Sustainability
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Natural food environment
Objective• Carbon and water footprint of food production
• Non-CO2 GHGEs (i.e., N20, CH4) related to food production
• Farm management practices related to:• Fertilizer and pesticide use• Use of irrigation• Food loss• Use of antibiotics• Land use• Farm workers
• Loss of biodiversity
• Contaminants or residues present in food harvested
• Food losses
Sustainability
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(Downs et al., 2018)
Case study 1: Exploring food environment measurement in Myanmar
• Food prices
• Types of foods sold within markets
• Social mapping
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Case study 2: Examining food systems in indigenous communities in Jharkhand, India
(Ghosh-Jerath et al., BMC Public Health 2019: 944)
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Mixed-methods approach to examining the food system
(Ghosh-Jerath et al., BMC Public Health 2019: 944)
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Mixed-methods approach to examining food environments
Study Methods Food Environments
Co
nsu
mer
pre
fere
nce
s
Ava
ilab
ility
&
Acc
ess
Div
ersi
ty
Safe
ty
Pro
mo
tio
n
& q
ual
ity
Aff
ord
abili
ty
Village transect
Focus groups (including free listing & pair wise ranking) to identify indigenous foods
Focus groups on climate change and resilience
Focus groups facilitators and barriers toindigenous food production and consumption
Market surveys
Nutrient analysis of wild foods
Agricultural diversity tool
Qualitative Quantitative Mixed-methods (qualitative and quantitative)
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Case study 3: Examining food environments in
informal settlements in Nairobi, Kenya
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Methods and metrics
Promotion & Quality
• Price data for key foods
• GIS Mapping
• Type of outlet/vendor
• ProColor diversity tool
• Photos of food outlets
• Captured data on types of
food sold (e.g., ready to eat)
• ProDesirability tool
• Packaging and branding
of food
Combined with qualitative data: Social mapping of food environment &
interviews/free listing of drivers of food choice
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