Is it possible that they just have food sensitivities? A lot of the symptoms overlap. You could try an elimination diet first to get rid of the sensitive seven – soy, corn, wheat (but I would do all gluten), dairy, eggs, sugar, and peanuts. If you don’t see improvement with that then you could try the candida diet. If you do, I would be sure to work with a registered dietitian to make sure they’re getting everything they need.
What symptoms do they have?