Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God. 2 Corinthians 7:1
Every practice that weakens physical or mental strength unfits man for the service of his Creator. And will God be pleased with anything less than the best we can offer? Said Christ: "Thou shalt love to Lord thy God with all thy heart." Those who do love God with all the heart will desire to give Him the best service of their life, and they will be constantly seeking to bring every power of their being into harmony with the laws that will promote their ability to do His will. They will not, by the indulgence of appetite or passion, enfeeble or defile the offering which they present to their heavenly Father.
Peter says: "Abstain from fleshly lusts, which war against the soul" (1 Peter 2:11). Every sinful gratification tends to benumb the faculties and deaden the mental and spiritual perceptions, and the word or the Spirit of God can make but a feeble impression upon the heart. Paul writes to the Corinthians: "Let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God" (2 Corinthians 7:1). And with the fruits of the Spirit--"love, joy, peace, long-suffering, gentleness, goodness, faith, meekness"--he classes "temperance" (Galatians 5:22, 23). (The Great Controversy, 473, 474)
Reflection: All through the Bible diet played in integral part of the followers of God. It was so important that Christ's first temptation was on appetite. Let us be more diligent in this area.