Whether his department conducted any research on the potential effectiveness of the Health Promotion Levy (HPL) to reduce the level of obesity in the Republic prior to the implementation of the HPL; if not, why not; if so, (a) by whom was the research conducted, (b) on what date was the research conducted, (c) what did the research reveal about the likely impact of the HPL and (d) will he furnish Mr D W Macpherson with a copy of the research?