Jeurys Familia and Edwin Díaz hope improved nutrition leads to better results.
Familia weighed 270 pounds at the end of last season, when he was 4-2 with a 5.70 ERA, allowing 62 hits in 60 innings with 63 strikeouts.
Díaz was acquired from the Mariners along with second baseman Robinson Canó. He struggled with his slider and went 2-7 with a 5.59 ERA and seven blown saves in 33 chances.
He lost the closer's job, and the Mets suggested he consider looking at his diet.