Since announcing his return to the Cleveland Cavaliers, LeBron James has turned up to public events looking noticeably thinner than he did when last seen in the NBA playoffs with the Miami Heat.

Other basketball stars such as Carmelo Anthony of the New York Knicks appear to be following the lead of the league's best player, and the explanation may be a diet low in carbs and high in fat, including foods like cheese and butter.

But not everyone is convinced this fad is a good idea for athletes.

Watch the video above for more.