No one can authoritatively state as to what constitutes normal and abnormal when it comes to the emotional matters of the heart and mind. If at all, I can certainly say that it is not an illness and most likely just that your mind is distracted from the typical hunger signals of your body.
You will surely out-grow this phase as you grow older. For now, just go with the flow as long as the loss of appetite doesn't cause significant weight loss or health problems
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