Sam Smith has praised nutritionist Amelia Freer after losing over a stone in just two weeks.

The singer took to Instagram overnight to pay tribute to the author of the book Eat. Nourish. Glow.

He said that she has guided him towards substantial weight loss by making him live "healthy".

Smith wrote: "Three weeks ago I met a woman who has completely changed my life.

"Amelia Freer has helped me lose over a stone in 2 weeks and has completely transformed my relationship with food. Everyone go check out her incredible book, and start to live healthy. It's not even about weight loss it's about feeling happy in yourself.

"Love you Amelia & thank you for making me feel so happy inside and out @ameliafreer #eatnourishglow."

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Watch Sam Smith being interviewed below: