Was the genetics programme about genetics?

On Thursday 23rd May (2013), Channel 4 aired a programme called "Fat Family Tree". It had good PR coverage the week before and was billed as an insight into weight and genetics. I was thus looking forward to it. I was sorely disappointed.

The Introduction

Dr. Dawn Harper, a GP for 18 years, opened the programme by saying "There's no doubt that some people do seem to put on weight more easily...