“The pouch is then connected to your small intestine, missing out (bypassing) the rest of the stomach.
“This means it takes less food to make you feel full and you’ll absorb fewer calories from the food you eat.”
After the surgery, Vanessa appeared on This Morning to explain she had lost three stone.
She told the presenters she had become less interested in food since having the surgery.
Vanessa said: “I’ve lost just under three stone so I’m absolutely loving that. What I’ve experienced is just feeling a bit less interested in food.