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Why Thiamine?
Thiamine deficiency remains a pressing public health issue. Infantile beriberi, a disease caused by thiamine deficiency, presents during the exclusive breastfeeding period and without treatment commonly results in death within hours of clinical presentation. There is also growing evidence suggesting sub-clinical thiamine deficiency may have a measurable, lasting impact on cognitive development and psychomotor functions. However, addressing the spectrum of thiamine deficiency disorders (TDD) is impeded by several gaps in knowledge. This initiative seeks to address the key gaps in our knowledge of TDD and to develop a model for control of TDD in the most affected countries.
What's Next?
The Academy is now engaged in a research project to reduce the global burden of thiamine deficiency. With funding from the Bill & Melinda Gates Foundation, this project includes a number of research partners around the world and fill several research gaps.
Key Knowledge Gaps
1. Limitations in assessing status.
2. Lack of knowledge about prevalence, particularly in sub-Saharan Africa
3. Lack of strategy to address deficiencies, particularly during lactation
4. No standard approach to surveillance and prevention
5. No standard case definition
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Useful Documents
Thiamine content of foods in key countries
Thiamine availability based on food balance sheets (2011)
Thiamine availability below 1.2 mg/capita/day
High % of energy from low-thiamine staple crops
Analysis of thiamine biomarkers
Guidance to assess thiamine biomarkers
Analytical requirements of ThDP and ETKA
Large-scale survey on thiamine status
Food fortification with thiamine
Countries with existing thiamine fortification programs
Educational materials
For healthcare professionals: “Thiamine deficiency disorders: identification and treatment”
For healthcare professionals: “Infantile beriberi: clinical symptoms and case studies”
For healthcare professionals: “A guide to increase thiamine intake and prevent thiamine deficiency”.
For pregnant women and lactating mothers: “The importance of thiamine during pregnancy, breastfeeding and infancy”
Relevant websites
Global Fortification Data Exchange
Key scientific publications
Whitfield, K.C., Bourassa, M.W., Adamolekun, B., et al. (2018). Thiamine deficiency disorders: diagnosis, prevalence, and a roadmap for global control programs. Annals of the New York Academy of Sciences, 1430(1), 3-43.
Hiffler, L., Adamolekun, B., Fischer, P.R., Fattal-Vavleski, A. (2017). Thiamine content of F‐75 therapeutic milk for complicated severe acute malnutrition: time for a change? Annals of the New York Academy of Sciences, 1404(1), 20-26.
Adamolekun, B., Hiffler, L. (2017). A diagnosis and treatment gap for thiamine deficiency disorders in sub-Saharan Africa? Annals of the New York Academy of Sciences, 1408(1), 15-19.
Whitfield, K.C., Karakochuk, C.D., Kroeun, H., et al. (2017). Household consumption of thiamin-fortified fish sauce increases erythrocyte thiamin concentrations among rural Cambodian women and their children younger than 5 years of age: a randomized controlled efficacy trial. The Journal of Pediatrics, 181, 242-247.
Johnson, C. R., Fischer, P. R., Thacher, T. D., et al. (2019). Thiamin deficiency in low- and middle-income countries: Disorders, prevalences, previous interventions and current recommendations. Nutrition and Health.
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The Academy recently convened an expert panel to estimate the global burden of thiamine deficiency and related disease risks and to review possible intervention strategies to reduce the associated burden of disease. The panel concluded that there is a surprising lack of information on this condition, despite its likely importance as a cause of infant mortality in South Asia and possibly in other LMIC, and its known effects on child development. Following the panel’s recommendations, this initiative aims to address the key knowledge gaps that were identified through the following projects.
Supplementation
Determine the appropriate level of thiamine supplementation during lactation to provide adequate thiamine status for mothers and their infants. A dose response trial of lactating women in Cambodia will measure thiamine content in breast milk, as well as in the blood of mother and infants.
Cognitive Outcomes
There is evidence that even asymptomatic thiamine deficiency can cause long-lasting cognitive deficits. The infants enrolled in the supplementation trial will undergo neurological testing to look for cognitive differences between supplementation and placebo groups.
Fortification
Salt has been identified a good vehicle for thiamine fortification in South-East Asia. This project will measure salt consumption in Cambodia to inform the level of thiamine required to adequately fortify salt.
Biomarkers
The relationship between the two thiamine biomarkers, thiamine diphosphate and the erythrocyte transketolase assay, will be studied to assess which biomarker is best suited to identify thiamine deficiency.
African Surveys
Some neurological disorders found in Sub-Saharan Africa have similar symptoms to thiamine deficiency disorders and the increase in rice consumption has raised concern that thiamine deficiency may also be present in Africa. Pilot surveys will examine thiamine status in two populations in Africa.
Surveillance and Control Programs
Thiamine deficiency is most well known in South Asia and despite the efforts in the region, it remains a pervasive problem. This project will work with the countries to develop surveillance and control programs to reduce the burden thiamine deficiency through fortification, supplementation, education, behavior change and surveillance programs.
Thiamine Deficiency Disorder Case Definition
A clear case definition for TDD has not been established and creates challenges in efficiently diagnosing TDD. This program will use a case control design to establish a case definition based on cohorts of infants and children in Laos.
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Thiamine Workshops
Two technical workshops are planned in order to support the development of surveillance and control programs in countries where thiamine deficiency is a public health problem. While the first workshop was held in November 2019, both workshops aim to discuss steps to be taken by each country to roll out a TDD control and prevention program in their specific context; and provide necessary knowledge and training to establish their program.
Workshop 1, November 19-21, 2019, Luang Prabang
The first regional workshop was held in Luang Prabang, Lao PDR, with participation from several other countries in the region where thiamine deficiency is a public health problem. Participating countries included, Lao PDR, Myanmar, Cambodia, Bhutan, Thailand, Vietnam and India (Assam and Kashmir). The aims of this workshop were: to bring experts and the most current knowledge about prevalence, assessment, and possibly interventions for thiamine deficiency; assess individual country situation and need; and to introduce the Technical Reference Materials (TRMs). Discussions focused on the inputs and activities needed to enable country officials to begin planning their TDD control program.
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Workshop 2, Late 2020, Cambodia
The second regional workshop will be held with the same countries in 2020, using the TRMs as key resource but this time focusing on outputs, the use of the knowledge provided by the surveillance information, and on maximizing program outcomes. As that workshop will occur in the last year of the initiative, findings from other objectives will be available and will be incorporated in the TRMs as appropriate.