The difference is not much in the words, except for an 'e', but great when u stretch the 'e' to eating to non eating.
Those days when the eating times where difficult and food meager the feasting days were a celebration,but in cultures where the food was available in plenty they already had started the practice of fasting and balanced the rations.
A few lines in the difference between starving and fasting,
Starving is when u think of food and food is not available ,
fasting is where food is available and one plans to be away from it and get the mind on other matters, with the help of care takers.
I was once asked what is the rational for fasting when one should eat and make merry, difficult to answer that.
A home maker is busy with her whole household chores from morning till night, just say she is allowed to take rest with no work, and all things cared for, what will she do? she may sleep or she may ( no no no no shopping and no ladies club) while away her time with simple things like making her home more orderly, her energy will clean up all the mess.
In the same way when one is allowed to plan a fast and know how to break it , the energy used to digest could clean up messes with in ourselves, and god knows what and where all they are.