More and more young children and teenagers these days are becoming very particular about their diet.
These days, young children and teenagers have the tendency to be really picky about their diet.
These days, young children and teenagers tend to be really picky about what they eat.
ご質問どうもありがとうございます。
様々な表現があると思いますが、いくつかカジュアルな表現を紹介します。
一般的な発言(スピーチで問題提起のような形で使えそうなものともなります)
1. More and more young children and teenagers these days are becoming very particular about their diet.
2. These days, young children and teenagers have the tendency to be very particular about their diet.
---- be particular about something =
「something」の中で、よく考えて判断してから何かの区別にする
(これはOK、これはいけない、とか)
---- diet = この文脈では、「日常の(飲)食物」
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批判を込めた発言(スピーチで問題提起のような形で使えそうなものともなります)
3. These days, young children and teenagers have the tendency to be really picky about their diet.
4. These days, young children and teenagers tend to be really picky about what they eat.
--- be picky about something = something について、好き嫌いがある
お好みに合わせて使い分けてみてください。
ご参考にしていただければ幸いです。