Worried about my son

I just woke up and I can't help to put my mind on this and wounder and want to help.
At the age of three I wounder if he seen more people aroung hime eating food and seeing more kinds of food, Thanksgiving and Christmas and is wanting to eat what the people around him is eating, How many children liv in the house with him ?
There must be something on his mind and not eating, I would search out help, because I hope he is not sick. I will search out help here. I would say it's time to get him to a doctor because it's been to long for him not be eating