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It's a phase, and it could just be his tastes are evolving. Thing to remember is it's ok to have that conversation - cause it's true! - but also with a light touch because it can make eating a stressful routine which can backfire Part of it is just finding healthy foods he likes
I’ve resorted to telling my kid the elf on the shelf is watching and if she doesn’t eat her dinner Santa’s going to find out. Sort of jokingly but it gets her attention. 
