RT Dissertation/Thesis
T1 Nutrition and tuberculosis in Ethiopia : the role of vitamin D2 derived from sun exposed oyster mushroom on the treatment outcomes of tuberculosis
A1 Keflie,Tibebeselassie Seyoum
WP 2020/01/20
AB Tuberculosis (TB) is an old infectious disease which causes ill-health among millions of people each year. Effective anti-TB drugs are available since 1950’s, but still the global burden of TB remains enormous. The disease is very complex and there is a need to look for supportive treatment to the standard anti-TB drugs. Cognizant of this, the present doctoral study was undertaken by giving emphasis on nutrition and TB in Ethiopia. The aim of this doctoral dissertation thesis was to deal with the nutritional situation of people with and without TB and come-up with solutions that could support the effort of combating TB. In this thesis, five papers (four published and one submitted) were included.
The first paper encompassed the study of dietary and nutritional assessment. In this study, dietary inadequacy, poor nutritional quality and high risk of micro nutrient deficiencies were identified. The main dietary pattern included cereals, vegetables and legumes. About one-third of the population consumed animal source food (ASF). Malnutrition was the common problem in people with and without TB. This suggested that malnutrition may pave the way for TB.
The case-control study in the second paper revealed that more than one-half of TB patients had vitamin A and zinc deficiencies. More than three-fourth of TB patients had below half of the energy fulfillment. The protein intake was above the average fulfillment, but most TB patients relied on cereal-based diets. Patients with TB used a larger proportion of proteins from oral feeding for oxidation and hence for energy production. About half of the patients were undernourished. Thus, vitamin A and zinc deficiencies along with protein-energy malnutrition need to be addressed in the management program of TB.
The third paper included systematic review which explored the existence of vitamin D deficiency (VDD). Sunshine, which is very important for the synthesis of vitamin D under the
skin is widely available in Africa throughout the year. Surprisingly, more than three-fourth of TB patients in Africa had VDD and vitamin D insufficiency (VDI). Statistically significant variables such as use of sun protection (lack of sun-exposure), inadequate dietary intake, low
body mass index (BMI), high skin pigmentation, use of drugs (anti-retro viral and /or anti-TB), low socioeconomic status, rainy season, covering body skin with clothes, old age and co-morbidity were identified as the main predictor variables that hampered the status of vitamin D.
Vitamin D can be obtained from dietary intakes apart from endogenous synthesis after sun exposure. Mushroom as such, is a potential non-animal source of vitamin D. The experimental study in the fourth paper revealed that sun-exposure significantly increased the content of vitamin D2 in oyster mushroom. Increasing the surface area for sun-exposure enhanced the production of vitamin D2. Other factors such as duration of sun-exposure and moisture content determined the production of vitamin D2. Exposing slices of oyster mushroom to direct sun for brief period provided enough vitamin D2 that could satisfy the current recommended dietary allowance (RDA) of vitamin D without any visible changes in color and texture.
The study in the fifth paper was a randomized controlled trial and demonstrated for the first time the role of mushroom-derived vitamin D2 on the treatment outcomes of TB. Intervention with vitamin D2 derived from sun-exposed oyster mushrooms brought significant improvement in vitamin D status, clinical outcomes and immunological responses, but not in sputum smear and culture conversion. The intervention corrected VDD in more than one-third of TB patients. About one-third of the variability in TB score in the intervention group was accounted for by the change in the serum 25 hydroxy (OH) vitamin D level. There were also significant improvements in the serum IFN-gamma and cathelicidin LL-37 peptide levels after intervention. The balance of cytokines was skewed to TH1 responses due to high level of IFN-gamma. Thus, mushroom-derived vitamin D2 could serve as potential, safe, easily available and cost-effective adjunctive therapy for TB. Taken collectively, foods enriched with vitamin D need to be included in the national TB control program to support the first line anti-TB drugs, increase the cure rate and reduce the infectiousness of TB.
K1 Ernährung
K1 Pilze
K1 Vitamin-D-Gruppe
K1 Tuberkulose
K1 Tuberkulose
PP Hohenheim
PB Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim
UL http://opus.uni-hohenheim.de/volltexte/2020/1682