When does eating become gluttony?

I know it’s an immoderate desire for food, but what about eating every 2 hours for the sake of eating?

Obsessively/excessively eating to the point it prevents us from properly fulfilling our responsibilities would fall under gluttony. Eating every 2 hours for health reasons or as part of a consistent regiment is not gluttony. If however we simply refuse to resist the temptation to eat certain things then eating every 2 hours could fall under gluttony.

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