With so many people now classed as clinically obese, many have theories on why this has happened. But Gabriel's investigation reveals some surprising conclusions.
She discovers the hidden battles between hormones that control people's appetites may be to blame, and sees the latest surgery that fundamentally changes what a patient wants to eat by altering how their brains work. Gabriel is shocked to find out that when it comes to being overweight, it is not always your fault you are fat.