question about fasting

When you pray and fast for an intention for example, what kind of fasting do you do?

I get migraines when I do not eat from low blood sugar so if I am going to fast I will fast from sugar like cookies, etc. or I will fast from talking on the phone, getting on the computer, there are many ways to fast, and many things you can give up in the fasting.

Basically it all can become a great sacrifice for Christ.

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