I wouldn't worry too much. If he was my own child, I wouldn't like that diet, but since the child is okay, and is probably getting (sort of) enough basic nutrients one way or another, and is okay with bmi, it's beyond what is your call.

Fruit gives the same vitamins as vegies, they just come with unneccessary sugar. Kids who don't eat proteins will often pig out on whole grains to try to get more protein that way. He wouldn't be okay for height if he wasn't getting some protein.

Yes, the high sugar/carb diet isn't good for him, but it's not immediate so it's not something you can do much about except maybe mention something if you feel like the parents might listen.

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