Hester Hendrina Vorster

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OBJECTIVE The aim of the National Food Consumption Survey (NFCS) in South Africa was to determine the nutrient intakes and anthropometric status of children (1-9 years old), as well as factors that influence their dietary intake. DESIGN This was a cross-sectional survey of a nationally representative sample of all children aged 1-9 years in South Africa.(More)
Polymorphic N-acetyltransferase genes (NAT1 and NAT2) determine rapid or slow acetylation phenotypes, which are believed to affect cancer risk related to environmental exposure. Black South Africans have a unique incidence pattern of environment-related cancers, but genetic characteristics of this population are mostly unknown. In this study, we compared(More)
OBJECTIVE Practical use of the glycaemic index (GI), as recommended by the FAO/WHO, requires an evaluation of the recommended method. Our purpose was to determine the magnitude and sources of variation of the GI values obtained by experienced investigators in different international centres. DESIGN GI values of four centrally provided foods (instant(More)
The Scientific Update involved consideration of a number of key issues that have arisen since the Joint FAO/WHO Expert Consultation on Carbohydrates in Human Nutrition was held in 1997 (FAO, 1998) or where new data may have altered conclusions drawn some 10 years ago. The Scientific Update enabled some firm conclusions to be drawn and identified a number of(More)
OBJECTIVE To determine the relative validity of the culture-sensitive quantitative food frequency questionnaire (QFFQ) developed for the Transition, Health and Urbanisation in South Africa (THUSA) study by 7-day weighed food records, urinary nitrogen excretion and basal metabolic rate (BMR). DESIGN A cross-sectional study. SETTING A community-based(More)
OBJECTIVE To review the available data on risk factors for cardiovascular disease (CVD), the influence of urbanisation of Africans on these risk factors, and to examine why stroke emerges as a higher risk than ischaemic heart disease (IHD) in the health transition of black South Africans. DESIGN A review of published data on mortality from and risk(More)
PREFACE In this review, the Nutrition Research Group provides a timely and useful overview of the state of knowledge about nutritional status and the causes of malnutrition in South Africa. The review covers a period of 21 years, from 1975 to 1996. Due to shortcomings in the data, it is unfortunately not possible to analyse trends over this period. The(More)
Hydrogen gas, which is produced during fermentation in the human colon, is either excreted in breath or metabolised by gut bacteria through a variety of pathways. These may include methanogenesis, dissimilatory sulphate reduction, and acetogenesis. To determine which of these routes predominates in the large intestine, stools were taken from 30 healthy(More)
OBJECTIVE To describe how urbanisation influences the nutrition and health transition in South Africa by using data from the THUSA (Transition and Health during Urbanisation of South Africans) study. DESIGN The THUSA study was a cross-sectional, comparative, population-based survey. SETTING The North West Province of South Africa. SUBJECTS In total,(More)
Current concerns about the increased risk of cardiovascular and other diseases induced by excessive weight gain in children and adults have been highlighted by the Surgeon General’s report on the problem of obesity in the United States.1 This call to action followed a global analysis of the problem of excess weight and how to define and combat it that was(More)