If he knows he is going to get treats, then there is no reason for him to eat his meals. If he isn't getting any treats and not eating for several days, then I would talk to his vet. Some vets will want you to keep switching foods or putting toppers on them and others won't.
What were the credentials of the nutritionist? Many people call themselves nutritionists and really have not been properly trained. Egg shell is fine, but is that being balanced with phosphorus? What about trace minerals? It is very dangerous to give a homecooked diet with just egg shell. If you go to petdiets.com and read about the credentials that the recipe creator has - that is what you're looking for. They really should be both a veterinarian and a nutritionist. If it isn't done right, you may see skeletal, blood, heart, and eye issues.
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