Dr Denise Robertson, Senior Lecturer in Nutritional Physiology, appeared in the first episode of the new series on BBC Two.
The new three-part series sees medical journalist Michael Mosley and a team of doctors investigate the truth behind various health claims being made in the media.
As part of the first programme, Dr Robertson revealed how leftovers could be healthier than the original meal due to 'resistant starch'.
Read more about the research on the Trust Me, I'm a Doctor website.
You can watch the full episode on the BBC iPlayer.
Last year, Trust Me, I'm a Doctor featured Surrey’s research into the impact of an extra hour of sleep.