Are you running anything currently? High drug levels (especially orals) are quite known to kill appetite.
Hows the body fat? May be time to do a "mini cut" and bring food levels down as well as body fat.
Hows recovery? Typically overreaching (I don't like to call it overtraining) can only be done so long, as well as force feeding, if progress is starting to stall may want to evaluate your training.
Adding in cardio is ALWAYS a good option when appetite starts to die.
I do a form of intermittent fasting, simply because I'm not typically to hungry at breakfast and don't like breakfast style foods - I'm not a believer and literature supports this as well that you need breakfast or food late night. As long as you're able to hit your daily goals - you should be ok.