National's deputy leader Paula Bennett has spoken out about her gastric bypass calling the 12 months that followed it the "hardest thing physically" she has ever done.

Bennett took to her official Facebook account last night to make a personal post about the 12 months since she had her gastric bypass which has seen her shed 50kg.

"My weight has never defined who I am and it still doesn't.

"My body is simply the vessel that carries me around and currently it is smaller," Bennett said.

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Paula Bennett, pictured here with sports commentator Keith Quinn, has shed 50kg.
Paula Bennett, pictured here with sports commentator Keith Quinn, has shed 50kg.

The shift had been life-changing, mainly for her health, and she felt both different and "exactly the same".

She also took the opportunity to answer the most asked questions about the bypass and her weight loss.

The National MP has shed 50kg thanks to weight loss surgery.
The National MP has shed 50kg thanks to weight loss surgery.

"No I don't have huge amounts of extra skin.

"No I don't know what you should do, it's very personal."

Yes, she ate differently and much less and yes, she could drink wine, have chocolate or a meat pie.

She thanked the public for their kinds words over the year.

In January Bennett revealed she had undergone the surgery around Christmas of 2017.

Paula Bennett in August 2017.
Paula Bennett in August 2017.

She went public with the procedure through the Herald on Sunday, talking candidly about the health reasons for having the operation and saying she hoped talking about it would encourage other New Zealanders in their respective weight battles.

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"I hope it sends a positive message out there to other people with weight or health problems that this may be a solution for them," she said in an exclusive interview.

Bennett joined an ever-growing list of political high-flyers who have undergone variations of gastric surgery; including former PMs Dame Jenny Shipley and David Lange, current MP Anne Tolley, and ex-MPs Dame Tariana Turia, Chester Borrows, Marama Fox and Donna Awatere Huata.

Gastric bypasses, which involve making a small pouch from the upper stomach, meaning people feel fuller despite eating less, take up to three hours to complete and are normally done via keyhole surgery.

Combined with a healthy diet and exercise, in most cases they lead to dramatic weight losses and an improved quality of life.