He is the poster child for healthy living.
poster child
idiomOne who is a prototypical or quintessential example of something.
Origin
disputed originFrom the usage of appealing young people and children in charitable advertisements.
After winning the marathon, she became the poster child for the new fitness program.
The small town became the poster child for economic decline after the local factory closed its doors forever.
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call someone everything but a child of God
To call someone many abusive names.
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heavy with child
visibly pregnant
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poster boy
A male exemplar of some trait.
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poster girl
A female exemplar of some trait.
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problem child
Someone or something persistently difficult or vexing; a frequent source of trouble or annoyance.
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sweet summer child
Someone who is naive, or who has never experienced hardship.