Man Shall not live on bread alone..

I used to never really understood what does this verse really meant and I kinda found it curious what does Jesus really meant when he mentioned this verse. Surely he does not mean that we do not need to eat to live. If he meant that with faith we can get through life without eating, then I don't just find that hard to believe, I would find myself in a position of being hard to accept it as well.
These days, morning seems to be more and more different to me. Hunger seems to affect me more in the morning than any other times. In fact, my mood changes when I am hungry. Due to my cravings for food, I tend to become a different person. Fearful, rash, mean, unpolished. When I am hungry, I find that that is the period of time when my mind struggles most to do things that pleases God. Its like a senseless me, and when I regain my senses after eating, I start to regret all that I said and all that I have done. It used to be when I have just woke up from my sleep, I will be really grumpy and mean to the people around me. The ones who would noticed this sooner than later would be my family members. God knows how many times they had to put up with my grumpy side.
Confronted by God, I knew I cannot let such circumstances make me sin against God. In fact, I cannot let any circumstances allow me to sin against God for I am fully equipped to please God in every circumstances. Thats when the bible really spoke to me. Men shall not live on bread alone, but by every word from the mouth of God. The word of God is and will be the only thing I rely on in the future. God forbid it that I rely on bread to go about not sinning.