The Fear
A Wise Man (once sat next to him)
Was it this one ? I think they showed it again in the week.
https://www.channel4.com/programmes/how-to-keep-a-healthy-weight-michael-mosley
Yes, that is it, to do with maintaining after the people had lost weight.
It was the follow up to https://www.channel4.com/programmes/lose-a-stone-in-21-days-with-michael-mosley/episode-guide/
.. a lot of it I thought was ott and others reviewing said similar.
But the bit about yo-yo dieting in the follow up was interesting. Think it was at least half way through the programme. It is on channel 4 catch up still.