[3] Lewith obtained a significant number of institutional peer reviewed fellowships at doctoral and post-doctoral level[citation needed] and was principal investigator or collaborator in research grants totally over £5 million during the last decade.
[27] In 1997, Lewith presented a documentary series examining complementary medicine for Channel 4 called Natural Born Healers.
[29] However, the series also drew criticism from Dr. Peter May and colleagues at the Grove Medical Practice in Southampton, who had cooperated with the programme, in a complaint to HealthWatch.
[32][33] A 2006 BBC documentary series, Alternative Medicine, was criticised by several people, including Lewith, in the Guardian over a controversial sequence in which acupuncture appeared to be used as a replacement for general anaesthesia during open heart surgery.
[34] Lewith had participated in the series as an advisor, but criticised the programme for inappropriate sensationalism and poor interpretation of science.
In criticisms published in the British Medical Journal, both Jane Cassidy and David Colquhoun criticise Lewith, claiming that he prescribes homoeopathy despite having written papers that conclude it doesn't work.