(CNN)Sam Smith does not want his weight to "Stay With Me." The Grammy-winning singer has shed 14 pounds and is crediting author Amelia Freer with his new slimmer look. Freer is a nutritional expert and writer of the book "Eat. Nourish. Glow." Smith gave her a shoutout on an Instagram photo that shows his weight loss. "Three weeks ago I met a woman who has completely changed my life," he wrote. "Amelia Freer has helped me lose over a stone in 2 weeks and has completely transformed my relationship with food." Freer said she decided to dedicate herself to helping people change their lives via healthier eating years ago, when she was working as an assistant to Prince Charles, according to the Daily Mail. "I used to arrive home exhausted (not because of the job, it turns out, but because of my terrible diet), with no energy to cook, so I would have cheese on toast or a plate of pasta with a glass of wine, slumped in front of the TV," she said. "I was tired all the time. My tummy looked and felt like a football most days, and I still had acne. I took several courses of the acne drug Roaccutane, and that's when my body said, 'Enough!' " After visiting a nutritionist and learning about the effects of food on the body, Freer decided to become one. Smith has been open about his struggle with weight, even touching on it during a speech in February after one of several Grammy wins. "Before I made this record, I was doing everything to try and get my music heard," Smith said. "I tried to lose weight, and I was making awful music, and it was only until that I started to be myself that the music started to flow and people started to listen."
The Grammy-winning singer shed the weight quickly . He thanked the author of a book on healthy living .