Scientific weight loss videos

I recently came across this really interesting, scientific approach to what does and doesn't work with weightloss. As someone who leans towards the nerdy side of life, I like to know not only what works, but also how it works and how they know it works.

This is a 10 minute clip of a programme, which is continued in about 6 other clips on youtube. You can watch the rest if you want to from there on.