Sam Smith has lost a ton of weight and is showing it off on Instagram. Yesterday, he posted a photo of himself at the gym and earlier this week he thanked the woman responsible for his diet.

"Three weeks ago I met a woman who has completely changed my life," he captioned a photo of him holding her book. "Amelia Freer has helped me lose over a stone [14 pounds] 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."

Back in December photos surfaced of Smith wearing swim trunks while on vacation with friends in Sidney, Australia. After seeing the images, Howard Stern called Smith "chubby and gay," leading the singer to post on Twitter, "Can't believe what I've just read. Ignore."

Smith's weight loss journey began prior to the Grammys. In his cover story, he told Rolling Stone that he struggles at time with body image.

"I just want to lose weight for the Grammys, if I'm honest," he told them. "I'm just very body-conscious. Sometimes I'm really proud that I don't look like other pop stars. But there's also moments where I'm like, 'Ugh, I wish I had abs like Bieber.'"

He also recently revealed to The Sun that he had to deal with bullying in his past.

"There's a lot of homophobia and bullying in the gay community," he explained. "There's also a lot of body dysmorphia in the gay community, which means if you're not toned and skinny it can be awful."

Although we loved Smith just the way he was, we're happy he is now feeling happy and healthy with his new body.

Check out the before and after comparison above, and let us know what you think in the comments section!

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