People who are biased about what they eat usually only eat sweet stuff like candy and ice cream. This picky eating gives them a really unbalanced diet. Candy and ice cream are okay, but you have to be open to eating other things too.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
I’m worried because my kids tend to have unbalanced diets.