Calvin Harris wants Sam Smith to write book on weight loss

Calvin Harris is so impressed by singer Sam Smith's weight loss that he has suggested him to pen a book on the same.

The 32-year-old Scottish DJ took to Twitter to praise Smith for the weight loss, reported E! online.

"Sam smith weight loss is legendary he should write a book big up Sam smith @samsmithworld," he wrote.

Smith, 23, who admits he is a huge foodie, has lost a significant amount of weight in a short amount of time, with the help of nutritionist and author Amelia Freer.