We Are Blessed When We Fast

"Isaiah, an Old Testament prophet, wrote of the Lord’s rich promises to those who fast and help the needy. We are promised peace, improved health, and spiritual guidance. Isaiah tells us of the blessings that come when we fast: “Then shall thy light break forth as the morning, and thine health shall spring forth speedily: and thy righteousness shall go before thee; the glory of the Lord shall be thy reward. Then shalt thou call, and the Lord shall answer; thou shalt cry, and he shall say, Here I am” (Isaiah 58:8–9).
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Fasting improves our lives and gives us added strength. It helps us live other principles of the gospel because it draws us nearer to the Lord." - LDS.ORG

Scripture References: 

Omni 1:26 And now, my beloved brethren, I would that ye should come unto Christ, who is the Holy One of Israel, and partake of his salvation, and the power of his redemption. Yea, come unto him, and offer your whole souls as an offering unto him, and continue in fasting and praying, and endure to the end; and as the Lord liveth ye will be saved.

Helaman 3:35 Nevertheless they did fast and pray oft, and did wax stronger and stronger in their humility, and firmer and firmer in the faith of Christ, unto the filling their souls with joy and consolation, yea, even to the purifying and the sanctification of their hearts, which sanctification cometh because of their yielding their hearts unto God.