Fasting may cause your body to go into survival mode, as mentioned earlier, forcing your brain to have more focus on certain tasks at hand. I find the first three days I struggle, usually with a headache. After the initial cleansing phase I do great until about day eleven, then I may find difficulty in searching for words, but I can comprehend what I read or study far better. Everyone is different. Try fasting and see how it affects you.
The changes that happen in your brain during fasting are the same that happens when you are exercising. In layman terms, brain power can increase significantly for a certain time period. By the end of my twenty-one day fast I could care less about whether I eat or not. Usually, God has done so much for me and in me I could go on fasting. When I return to eating my portion size has drastically decreased.
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I believe in you and you need to believe in yourself.