Father Christmas should get off his sleigh and walk, lay off the mince pies and go easy on the beer and brandy, says research from the University of Monash in Melbourne. Santa Claus, it says, is one of the most widely recognised figures in the world, and it's about time he started looking after his health, because he's a terrible role model.

lay off the mince pies and go easy on the beer and brandy
lay off: stop doing something (here, eating) 停止做某事
Lay off bullying Jack.
别再欺负杰克.

go easy on: not do something (here, drinking alcohol) as much as he usually does
go easy on/with something: used to tell somebody not to use too much of something 省着点;少用些;别浪费
Go easy on the sugar.
糖要省着点用.

a terrible role model: not a very good example for people (here, young children)