I watched it last week. Was really interesting, especially the part about drinking tea (coffee) with 2 sugars (which I do) and how much weight you'd put on if you didn't burn it off.

I've linked 11 minutes 3 seconds in here:
https://www.youtube.com/watch?v=MqatoGRW9TI&t=11m3s

Full episode is here on BBC iPlayer:
http://www.bbc.co.uk/programmes/b05n2bn7

Worth a watch. Tonight it's The Truth about Calories