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Micronutrient Enhancement
through Biofortification through Biofortification
Sherry A. Tanumihardjo
Department of Nutritional Sciences
University of Wisconsin-Madison,
Wisconsin, USA
Distribution of 10.9 million deaths among children
less than 5 years old in all developing countries, 2000
Malaria
8%
Measles
5%
Diarrhoea
12%
HIV
4%
ARI
Perinatal
22%
Other
29%
ARI
20%Malnutrition
60%
Current dimensions of major forms of malnutrition
Intra-uterine growth retardation
• 30 million/year
(23.8% of all births)
Protein-energy malnutrition
• 159 million under-5 children
Iodine deficiency disorders
• 740 million
�Low birth weight
�Brain damage
� Increased morbidity &
mortality
� Brain damage
� Blindness• 740 million
Vitamin A deficiency
• 250 million under-5 children
Anaemia including iron deficiency
• 2 billion
Obesity
• >300 million people
WHO/NHD
� Increased morbidity & mortality
� Impaired motor development
�Reduced physical activity
�CVD & Diabetes
� Blindness
� Increased morbidity &
mortality
Functional and storage iron– Hemoglobin (85%) - iron containing pigment in RBCs
– Myoglobin (5%) - holds oxygen in muscle tissue
– Cytochromes - enzymes important in cellular respiration
– Iron sulfur proteins - important in electron transport
Transferrin - iron carrying protein in the blood– Transferrin - iron carrying protein in the blood
– Serum ferritin - iron storing protein also found in
liver, spleen and bone marrow
– Hemosiderin – derived from hemoglobin and can be
reused
– Enzyme cofactor - peroxidase, catalase
– DNA synthesis - ribonucleotide reductase
Symptoms of iron deficiency anemia
• Pallor
• Weakness
• Palpitations
• Reduced work • Weakness
• Fatigue
• Dyspnea
• Reduced work
capacity
• Short attention span
Xerophthalmia classification
• XN Nightblindness
• X1A Conjunctival xerosis
• XB Bitot’s spot
• X1B Bitot’s spot with conjunctival xerosis
• X2 Corneal xerosis• X2 Corneal xerosis
• X3A Corneal ulceration with xerosis
• X3B Keratomalacia
• XF Xerophthalmia fundus
• XS Corneal scars
CAN LEAD TO BLINDNESS!
Why are we supplementing
women and children?• Vitamin A status is
compromised for both
mothers and infants in
many developing countries.many developing countries.
• Most sources of vitamin A
are derived from fruits and
vegetables and the ββββ-carotene is
perceived to not be available.
Effects of vitamin A supplementation
in populations with vitamin A-deficiency
• Reduced mortality in children <5 years by 23% (meta-analysis of 7 studies)
• Reduced mortality in pregnant women by 40%• Reduced mortality in pregnant women by 40%
• Reduced severity but not incidence of much respiratory and gastrointestinal disease
• Reduced incidence of malarial attacks by 30%
Beaton et al. Geneva: ACC/SCN, 1993.
Shankar et al. Lancet 1999;354:203-09.
West et al. BMJ 1999;318:570-75.
Intestinal wall
ββββ-Cabsorbed
Cleaved
Food
ββββ-Ctotal
ββββ-Cfreed
Bioaccessibility = ββββ-Cfreed / ββββ-Ctotal
Bioavailability = ββββ-C / ββββ-C
Tanumihardjo, IJVNR 72: 41, 2002
Retinal
Reduced
Retinol
Bioavailability = ββββ-Cabsorbed / ββββ-Ctotal
Bioconversion = Retinol / ββββ-Cabsorbed
Bioefficacy = Retinol / ββββ-Ctotal
Fortification
Addition of minerals or preformed
vitamin A to commonly consumed
foods, such as salt, sugar, maize
flour, rice and wheat.
Costs of Interventions to Reduce
Micronutrient Malnutrition
Worldwide:
• 500 million vitamin A capsules distributed annually – cost of $500 million
• $200 million public investments in salt • $200 million public investments in salt iodine fortification leveraged $1.5 billion in private industry contributions over a decade
• $2 per person per year for iron fortification of rice x 500 million people x 10 years = $10 billion
Nicaraguan sugar fortification
• Evaluation of baseline liver retinol reserves were
0.57 µµµµmol/g liver, well above deficient (0.07 µµµµmol/g
liver).
• One year after sugar fortification was
implemented, liver reserves increased to 1.2
µµµµmol/g liver. In 9 of 21 children, liver vitamin A
concentrations were >1.05 µµµµmol/g liver.
Biofortification
Greek word “bios” means “life”Greek word “bios” means “life”
Latin word “fortificare” means
“make strong”
MAKE LIFE STRONG!
Food
insecurity
Poverty
Poverty as it relates to hidden hunger
Hunger
Over-
nutrition
?
Nutrient
deficienciesHidden
hunger
Obesity
Tanumihardjo et al., JADA, 2007
Diets high in staple foods!!!
Advantages of Biofortification
• Targets the poor: eat high levels of food
staples
• Rural-based: complements fortification and
supplementationsupplementation
• Cost-effective: research at a central location can
be multiplied across countries and time
• Sustainable: investments are front-loaded, low
recurrent costs
Interdisciplinary Communication
and Cooperation is Essential
• Plant Breeders
• Molecular Biologists
• Food Technologists
• Human Nutritionists
• Extensionists
• Experts in Food Product Development/Marketing
• Communications
• Economists
Orange-fleshed sweet potato
Vitamin A equivalency factors: Sweet potato: ~13:1
Indian spinach: ~10:1
ββββ-carotene: ~6:1Haskell et al. Am J Clin Nutr
2004
0.004
0.0010.0020.0030.0040.0050.006
Change in liver stores of vitamin A
-0.004
-0.006-0.005-0.004-0.003-0.002-0.0010.0000.001
Intervention effect: -0.008 (-0.015, -0.001)
P = 0.0203
Intervention Control
Infants eating sweet potato
0.4
0.6
0.8
Liv
er
vit
am
in A
accu
mu
lati
on
Sweet potato
Sweet potato
Sachets or tablets
?
0
0.2
6 7 8 10 11 12 13
Age of child (mo)
Liv
er
vit
am
in A
accu
mu
lati
on
( µµ µµm
ol/
g)
Sweet potato
Tablets or sachets
Tanumihardjo, Comp. Rev. Food Sci. & Food Safety, 2008;7:373-81.
Sweet potato in Mozambique
• Effectiveness study using an integrated agricultural
and nutrition intervention
• 2 year intervention covering 2 agricultural cycles
• 90% of intervention households produced sweet
potatopotato
• Intervention children (n = 498) ate more sweet
potato and had higher serum retinol than controls
(n = 243)
Low et al. J Nutr. 2007;137:1320-7.
Towards Sustainable Nutrition Improvement
in Rural Mozambique
.
Taste tests are conducted at every adaptive trial harvest
to determine preferences of local consumers.
Towards Sustainable Nutrition Improvement
in Rural Mozambique
.
Sweet potato bread maker making bread at home and selling it at
the market under the name of Golden Bread.
Orange Sweetpotato
in Africa – a Success Story
• Active behavior change
• Agronomic ‘equality’ crucial
• Assistance to understanding and overcoming constraints to adoption crucialovercoming constraints to adoption crucial
• Farmer participation in breeding and varietal selection
• Seeds systems development
• Product and market development
Bioefficacy of biofortified maize
on vitamin A status
• To determine the bioefficacy of maize
with enhanced ββββ-carotene
• To determine the effect of ββββ-carotene and maize levels on vitamin A status
1.5
2.0
mo
l)
Results: Liver vitamin A was the same between the ββββ-carotene and high-ββββ-carotene maize group.
Bioconversion : ~3 µµµµg ββββ-carotene to 1 µµµµg retinol.
a
0.0
0.5
1.0
Control Maize BC VA
Treatment
Liv
er
VA
(µµ µµ
mo
l)
bb
c
Partnerships and tasks
• ZamSeed grew the maize
• National Food and Nutrition Commission
– Lusaka – coordinating and mobilizing
the community
• Tropical Research and Development • Tropical Research and Development
Center – Ndola – anthropology and
biochemistry
• University of Wisconsin – Madison –
randomization, field coordination,
oversight, unique biochemical markers
Sensitization
• Provincial health office: 2008
– Vitamin A status survey
– Follow-up with efficacy study
• Survey study in 2009• Survey study in 2009
– Identify six study sites
• Provincial health office: 2009
– Provincial permanent secretary office
– District health office
– District developing coordinating committee
(Jan 2010)
Engaging the community
• Facilitator
– Emily Ngulube – retired nurse-midwife
• Meetings with the community, headmen, church • Meetings with the community, headmen, church
leaders and volunteers.
• Social mobilization activities including drama
and open discussions
• Listed villages within the 6 study sites
• Confirm potential child participants in the
villages by household
A male child eating maize
0.5
0.6
0.7
0.8
0.9
1
Liv
er
vit
am
in A
ac
cu
mu
lati
on
m
ol/
g) Sugar
0
0.1
0.2
0.3
0.4
0.5
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Age of child (y)
Liv
er
vit
am
in A
ac
cu
mu
lati
on
(µ(µ (µ(µm
ol/
g)
Maize
Supplements
Bioconversion slows
Tanumihardjo, Comp. Rev. Food Sci. & Food Safety, 2008;7:373-81.
Adolescent girl
eating maize
2
3
4
5
tam
in A
ac
cu
mu
lati
on
(µµ µµ
mo
l/g
)
Fortified sugar (high intake)
?
0
1
13 14 15 16 17 18 19
Age of girl (y)
Liv
er
vit
am
in A
ac
cu
mu
lati
on
(
Fortified sugar (low intake)
Biofortified maize (low intake)
Biofortified maize (high intake)
Tanumihardjo, Comp Rev Food Sci & Food Safety, 2008;7:373-81
Visible traits
• Nutrition education becomes important
• Focus on children and expectant mothers
• Social marketing• Social marketing
• Convincing local farmers to grow
biofortified crops
Invisible traits
• Iron in rice in the Philippines
• Zinc in wheat in Pakistan• Zinc in wheat in Pakistan
Milled Dry Rice
As consumed:
400 grams per day x +10 mg/kg Fe =
+4.0 mg/day Fe
Absorbed (10% bioavailability):
+0.4 mg/day = 30% of the+0.4 mg/day = 30% of the
Mean physiological requirement for absorbed Fe
90% retention after boiling:
Requires +11 mg/kg Fe as purchased
Target for Breeders:
2 mg/kg (current average) + 11mg/kg = 13 mg/kg
5
6
7
8
9
10
Fin
al
bo
dy
iro
n (
mg
/kg
)
Total body iron after nine months of consuming
high-iron (+1.7 mg Fe/dy) or control rice
stratified by 3 levels of baseline body iron
Control
High-iron
p = .036
p = .032
NS
-0.5+0.6
-0.90.0
0
1
2
3
4
5
Fin
al
bo
dy
iro
n (
mg
/kg
)
1 2 3
Body iron at baseline (mg/kg)
p = .036
2.6 6.0 8.7
Least square means controlling for baseline body iron and amount of rice consumed over 9
months. Yellow numbers inside bars reflect changes from baseline value
+0.1+1.2
-0.5
High Zn Rice (increases in Fe as well)
How much extra zinc per day?
– Example: Adult women, rural areas
– Intake of 400 g milled, dry rice x
Zinc biofortification
– Intake of 400 g milled, dry rice x
+8 mg/kg Zn =
+3.2 mg Zn/day
– 40% of the Estimated Average
Requirement
Multinutrient approaches
• What if one could add high provitamin A
and zinc to maize?
• Not only would zinc and vitamin A status • Not only would zinc and vitamin A status
be improved but overall function.
• Zinc is involved in vitamin A metabolism.
Vision retinol retinal
Zn
monooxygenase
Digestion ββββ-carotene 2 retinol
Zn
Synergism between vitamin A and zincdehydrogenase
Protein synthesis
Zn retinol binding protein retinol:RBP in blood
(RBP)