I remember a radio show a few years ago which was a discussion program on the subject of popular weight loss diets.

The participants in this programme were the presenter, various advocates of different diet regimes, and a Professor of Nutrition at one of our (UK) universities.

The programme started with the presenter introducing everyone and then asking each advocate to state the case and present  evidence for their diet in turn, allowing time for the others to cross examine, argue, refute, agree with them or whatever.

You can imagine that there was a fair amount of heated disagreement, but any comment from the professor was completely absent.

At the end of the show, before signing off, the presenter thanked the participants and then said “Professor , you have said nothing throughout, do you have any comment to make before we finish?”

There was a pause, and then he answered – “I have listened to all this with interest.  But, the body is a chemical factory whose task is to turn raw material into energy.  And, frankly, it doesn’t care much what the raw material is”

End of programme – end of story!