Jeremy Hunt pledged today that he will follow scientific advice in his decisions as Health Secretary.
Mr Hunt's appointment to the health brief in last month's reshuffle sparked controversy because of his previous support for homeopathy and for a 12-week time limit for abortions.
On Friday, he declined to say whether he believed there was any scientific evidence to support his personal opinions on these issues.
But he said voters should be assured that, as Health Secretary, he would implement the will of Parliament rather than his own opinions and would be guided by scientific advice.
Controversy over abortion time limits was reignited earlier this month by an interview which the new Health Secretary gave to The Times, in which he said that he felt 12 weeks after conception was "the right point" for the limit on abortion, which currently stands at 24 weeks.
Challenged over his comments on the BBC Radio 4 Today programme, Mr Hunt said: "I was simply answering a question as to why I voted in the way I did in a free vote in 2008. I made it clear when I said that that it was a free vote, this is not Government policy to change the limit, and, as Health Secretary, my responsibility is to implement the democratic will of Parliament.
"Parliament voted in 2008 not to change the limit on abortions and that is the policy I will implement."
Mr Hunt declined to say whether his support for the 12-week limit was based on scientific evidence, but added: "It wasn't for a religious reason."
In 2007, Mr Hunt signed a parliamentary early-day motion praising the "positive contribution" of homeopathic hospitals in the NHS, despite repeated clinical trials which have found that homeopathic medicines - which contain heavily diluted traces of the substance causing the illness - are ineffective.
Asked whether he believes homeopathy works, Mr Hunt said: "I believe that my decisions as Health Secretary should be based on science and should be evidence-based and driven by evidence. I will follow the scientific advice.
"In everything I do I will follow the scientific advice. The important thing as Health Secretary is that I make decisions based on scientific advice."
Challenged over his previous support for homeopathy, the Health Secretary said: "We have to have some humility about what we don't know as well as what we do know, but I will follow that scientific advice absolutely. That is my job as Health Secretary."
Prime Minister David Cameron
Deputy Prime Minister Nick Clegg
Chancellor George Osborne
Foreign Secretary William Hague
Health Secretary Jeremy Hunt
After a stressful year in the DCMS, Jeremy Hunt moves from Culture to Health, replacing Andrew Lansley.
Home Secretary Theresa May
Cabinet Office Minister Francis Maude
Chief Secretary To The Treasury Danny Alexander
Minister without Portfolio, Ken Clarke
Having stepped down from the Justice Department, Clarke is supposedly staying in Government rather than hanging up his boots. Chris Grayling will replace him as Justice Secretary.
Justice Secretary Chris Grayling
Chris Grayling, formerly in the Department of Work and Pensions, will step up to hold the job vacated by Ken Clarke.
Culture Secretary Maria Miller
Maria Miller has taken up the DCMS job after Jeremy Hunt moved to the Department of Health. Miller is one of the few new faces in the cabinet.
Defence Secretary Philip Hammond
Communities Secretary Eric Pickles
Education Secretary Michael Gove
Minister for Internation Development, Justine Greening
Greening, who has been subject to plenty of rumours since her fallout over a potential third Heathrow runway. Greening was in No 10 for over an hour on Tuesday, presumably arguing her case and battling to stay in the cabinet. She will now take over Andrew Mitchell's spot at DfID.
Transport Secretary Patrick McLoughlin
McLoughlin, who has spent the past two years handling backbench rebels as Chief Whip, moves to the DfT, taking over from under-pressure Justine Greening. Greening has yet to be moved.
Energy Secretary Ed Davey
Attorney General Dominic Grieve
Cabinet Office Minister Oliver Letwin
Warsi, one of the earlest victims of the reshuffle, has been ousted as party co-chairman and is to be replaced by Grant Shapps. Warsi instead moves to to the Foreign Office as a junior minister, while also working as faith and communities minister.
Party Co-Chairman Grant Shapps
Shapps, who was the housing minister, is bumped up to party chairman, taking over from the demoted Sayeeda Warsi.
Environment Secretary Owen Paterson
Spelman leaves her post, to be replaced by the former Northern Ireland secretary Owen Paterson.
Work And Pensions Secretary Iain Duncan Smith
Leader of the House Andrew Lansley
Despite recently setting in motion huge overhauls to the NHS, Lansley has been moved to fill Sir George Young's spot as Leader of the House. Jeremy Hunt will succeed him in the Department of Health.
Business Secretary Vince Cable
Northern Ireland Secretary Theresa Villiers
Theresa Villiers, who gave nothing away as she approached Parliament with a wide smile on her face on Tuesday, replaces Owen Paterson. Paterson has moved to Defra.
Welsh Secretary David Jones
Cheryl Gillan was one name always likely to be taken off the list, and she is replaced by David Jones, who served beneath her as a Minister for Wales.
Scottish Secretary Michael Moore
Chief Whip Andrew Mitchell
Andrew Mitchell has moved moved from the Department for International Development to the role of Chief Whip, replacing Patrick McLoughlin.
Lords Leader Lord Strathclyde