Dear friend
It’s as good a reason as any as you are looking to strengthen yourself spiritually. Fasting can be done for a number of reasons, as a penance, as a way of prayer, as a sacrifice for a favour from God, to show your love of God to God alone, to strengthen the spirit and to withdraw from the world in a physical sense so that a person can deepen spiritually, obviously there are more aspects to it than this.
If you love bread and decide to have a fast and only have some amount of bread to eat and water, then this is missing the point! Fasting is abstenance from anything, you can fast from watching TV, you can fast from doing anything that is most enjoyable to you. People usually fast from food as it is most enjoyable to all the senses and is a necessity. How each individual fasts is individual!! there is no exact way to fast as long as you are mindful that God does not want you to harm yourself in the process. Some of the saints were granted magnificent graces where they could achieve extraordinary feats , some of whom could fast from food and deny themselves sleep for significant periods, this would not be recommended!!
One of the posts made me laugh about losing weight and that might be a by product from fasting, but my diet is very small and bland and fasting is something I do frequently, I’m quite chubby, I don’t know how!!! I must have the worlds slowest metabolism!! As for fasting from sleep, I find I cannot stay awake for more than one night, after this life becomes a bit hazy!!!
I once had a fast from sleep the night prior and went to church to pray the next day before our Lord in the Blessed Sacrament and fell asleep!! I was alone there and was I glad no-one saw me !!! Only my Lord saw me and it was so peaceful there with Him, I was so at peace and relaxed that sleep caught up with me.
If you do decide to make a regular fast for our Lord and God, wear a big smile, tell no-one when you are doing it and offer it up cheerfully. No-one has ever born as great a hardship as our Lord Jesus Christ and He never complained once.
God bless you and much love and peace to you
Teresa