folate and fortification- understanding the basics
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Folate and For+fica+on: Understanding the Basics
Presented by Lieven Bauwens Secretary General IF
Member of Food For+fica+on Ini+a+ve EMT
25th Annual Interna+onal Conference on Spina Bifida and Hydrocephalus
Argen+na, 6 June 2014
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The Plan…
• … folate
• … flour for,fica,on
Importance for health
Sources of Folate
Measuring Intake
Supplement Use
What is it? Why is it important?
Global Support & Impact
Best Prac+ces
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Methionine Synthase (B12)
Food
5-‐methyl Tetrahydro-‐
folate
5-‐methyl Tetrahydro-‐
folate
5-‐methyl Tetrahydro-‐
folate
5-‐methyl Tetrahydro-‐
folate
Homocysteine Methionine
Dihydro -‐folate
Uracil Thymine
DNA
Cell Division
Methylene Tetrahydro -‐folate
Tetrahydro -‐folate
Intes+ne Gut Wall Circula+on Dividing Cells
For+fied Food or Supplements
Folic Acid Folic Acid Folic Acid Folic Acid Folic Acid
Dihydro -‐folate reductase
Dihydro -‐folate reductase
Thymidylate synthase
(Proteins, DNA Lipids, Myelin) S-‐Adenosyl-‐
Homocysteine S-‐Adenosyl-‐ Methionine Methyl
Translerases
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Folate is Important for Everyone’s Health
• Needed for DNA, RNA and amino acid synthesis required for cell division
• Prevents certain types of anemia • Important for maintaining cardiovascular health
• Reduces the risk for neural tube defects • May reduce the risk for other congenital defects, au,sm, and others
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Rela+onship of Early Pregnancy Maternal RCF to Risk of NTD.
• Nested case-‐control study with 84 NTD affected pregnancies and 266 controls
• Risk was graded throughout the en,re normal RCF range
• Increasing the RCF to above 400 µg/L would be highly protec,ve.
• Risk is never 0
12!
10!
8!
6!
4!
2!
0!453!(200)!
906!(400)!
1360!(600)!
1813!(800)!
Red Cell Folate, nmol/L (µg/L)!
NTD
Risk
per
100
0 Bi
rths
Daly et al JAMA 1995
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Folate
FOOD FOLATE FOLIC ACID • Found in liver, dark green
vegetables, len,ls, beans, oranges, • Found in for,fied foods and
supplements • Water-‐soluble • Stable • Bioavailability ~50% in comparison
to folic acid supplement taken on empty stomach
• Bioavailability 1. Supplements taken on empty stomach~100% 2. Folic acid taken with food ~85%
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Folate Intake Europe
0
50
100
150
200
250
300
350
400
450
Intake (µ
g/da
y)
Average Folate Intake*
*without supplements or for,fied foods
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Recommenda+on for Women of childbearing Age
“ It is recommended that women capable of becoming pregnant consume 400 μg* of folate daily from supplements, for=fied foods, or both in addi;on to consuming
food folate from a varied diet.” -‐Ins=tute of Medicine
* As dietary folate equivalents (DFE)
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Preconcep+onal Folic Acid Use
31.5 27.6
18.6 19.2 12.2 12
0
10
20
30
40
50
60
70
80
90
100
Hungary Norway Portugal Spain Turkey UK
% S
tudy
Par
ticip
ants
1. Paulik E et al. Eur J Obstet Gynecol Reprod Biol. 2009 Jul; 145(1) 49-52. 2. Nilson R et al. Am J Clin Nutr 2006; 84 : 1134-1141. 3. Pinto, E et al. Public Health Nutr. 2009 Jul; 12(7):922-931.
4. Navarrete-Muñoz EM. Med Clin (Barc). 2010 Nov 13;135(14):637-43. 5. Baykan Z et al. Arch Gynecol Obstet (2011) 283:1249-1253. 6. Brough L. J Hum Nutr Diet. 2009 Apr; 22(2): 100-107.
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Daily Intake of Folic Acid
0
50
100
150
200
250
300
350
400
450
1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96
mic
ro g
ram
sN= 100 BUT:
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Termina+on is not preven+on
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Ignoring NTDs is not preven+on
NTDs
Other health outcomes: FA deficiency Stroke Heart disease Low birth weight Pre-‐term birth Other birth defects … Au,sm? Cancer occurrence? Cogni,ve decline / Alzheimer?
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Preven+on of NTDs Different strategies • Supplementa,on • For,fica,on • Diet • Oral contracep,ve + Folic Acid • Other
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Poten+al Solu+on 1: Supplements • Limita,ons:
– Cost and inconsistent use – Minority of women use folic acid supplements at the correct ,me for preven,ng NTDs (even when the pregnancy is a planned one) – important rela,on with socio-‐economic background
– Prior to concep,on and during the first 12 weeks of pregnancy, women need 400 microgram folate or folic acid per day.
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Poten+al Solu+on 2: For+fied flour • Pro
– Effec,ve – Simple and inexpensive – Requires no change in dietary paierns or individual decision
– Non-‐discrimina,ng
• Contra – Controversial (myths) – Reach – Challenge of monitoring and enforcing of legisla,on
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What is Flour For+fica+on?
• For,fica,on adds vitamins and minerals to flour during the milling process so that the foods made with wheat flour are more nutri,ous.
• Flour = wheat and maize flour (rice is very different)
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Essen+al Nutrients are Lost During the Wheat Milling Process
Adapted from “Wheat in Human Nutri,on” by W.R. Aykroyd and Joyce Doughty Food and Agriculture Organiza,on of the United Na,ons, Rome, 1970.
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Why For+fica+on of Cereal Grains?
• It is a public health interven,on • It helps address micronutrient malnutri,on by providing nutrients to deficient popula,ons and preven,ng new cases of deficiency
• Bread is widely consumed by individuals from all economic backgrounds
• It improves diet quality without requiring behavior change
• It is inexpensive per person per year
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IF Supports For+fica+on
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Consensus for For+fica+on
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Resolu+on on Birth Defects WHO WHA 63.17
To support Member States in developing na=onal plans for implementa=on of effec=ve
interven=ons to prevent and manage birth defects within their na,onal maternal, newborn and child health plan, strengthening health
systems and primary care, including improved coverage of vaccina,on against diseases such as measles and rubella, of addressing tobacco and alcohol use among pregnant women and women
trying to conceive, and food for=fica=on strategies, for the preven=on of birth defects, and
promo,ng equitable access to such services
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Success of for+fying flour with folic acid
• Eight regional studies from Argen,na, Canada, Chile, South Africa, and the United States report: – 31% to 78% reduced risk of neural tube defects aoer for,fying wheat flour with folic acid
– Overall 46% reduc,on in neural tube defects aoer for,fying flour with folic acid
Blencowe, H: Folic acid to reduce neonatal mortality form neural tube disorders International Journal of Epidemiology. April 2010 (suppl_1):i110-i121 . Istockphoto
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Success of for+fying flour with folic acid
Globally, an es,mated 22,000 birth defects were prevented in 2008 -‐ an average of 60 a day -‐ because wheat flour is for,fied with folic acid. However this amounted to just 9% of FA-‐ preventable NTDs.
Bell, Karen N., Oakley, Godfrey P. Update on Prevention of Folic Acid-Preventable Spina Bifida and Anencephaly. Birth Defects Research (Part A): Clinical and Moleculra Teratology. 85 2009:102-107
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Global Best Prac+ces
To plan a grain for,fica,on program, consider: • Local culture and cereal consump,on • Nutri,onal needs • Industry analysis • Crea,on of a mul,-‐sector na,onal for,fica,on alliance
• Legisla,on for mandatory for,fica,on • Monitoring the process and surveillance for birth defects
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Role of SB associa+ons
• Understanding the issue – NTD registra,on – Food and nutri,on intake
• Understanding the local situa,on • Build and be part of a Na,onal For,fica,on Alliance
• Advocacy • Monitoring of the ac,ons undertaken by government
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Conclusions
• Folate is one of essen,al micronutrients, intake ooen problema,c in women of childbearing age
• Rela,onship FA and NTDs is clearly established • There is a rela,onship with FA and other health issues • For,fica,on is a proven strategy to improve FA status in the whole popula,on
• AND/AND, not OR/OR • We have already achieved a lot, but s,ll a lot of work needs to be done
• Spina Bifida associa,ons are crucial partners in the FA debate
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Thank you!