sam-smith-grammysFor the past few weeks, Sam Smith‘s Instagram has been full of food photos. At first it didn’t seem like anything unusual was going on; Instagram is full of food photos, after all. He had photos of steaks, grilled mushrooms, and a lot of field greens. Sam Smith is a pretty good food photographer! But now he’s revealed what has been going on: He’s been following a “clean” eating plan, and now he says he’s lost 14 pounds in two weeks.

(Related: Sam Smith Just Invented The #BreakupSelfie With This Adorably Sad Instagram Post )

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Smith announced the massive weight loss with a black and white photo on Instagram.

“Three weeks ago I met a woman who has completely changed my life,” Smith wrote alongside a photo of himself in black and white. 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”

It is great that Smith says he feels good and that his new eating habits are not specifically about weight loss, but most of his post emphasizes the weight loss aspect, which makes it sound like that was the primary goal.

Smith’s new diet guru is Amelia Freer, a celebrity nutritionist with a book called Eat. Nourish. Glow. According to her website, she does not eat gluten, dairy, or refined sugar, and Boy George is also a client. My instinct is always to be skeptical of “clean eating” gurus, especially those attached to extreme celebrity weight loss, but the food photos Smith has been posting do look delicious.

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It’s great that Smith says he’s feeling good and eating healthfully. I’m surprised by the extreme rate of weight loss, though. 14 pounds in two weeks is a rate of a pound a day. Is there any way that can possibly be sustainable? It certainly doesn’t seem like it.

Freer’s website is full of recipes that look healthful and delicious, and not particularly crazy or painful like the food plans of other “clean eating” celebrities. (Cough*Gwyneth*Cough) But 14 pounds in two weeks does not sound realistic or sustainable.

Photos: Gabriel Olson/Film Magic/Getty Images, Instagram/SamSmith