Life is a gift of God. Our bodies have been given us to use in God's service, and He desires that we shall care for and appreciate them. Our bodies must be kept in the best possible condition physically, and under the most spiritual influences. . . .
A pure, healthy life is most favorable for the perfection of Christian character and for the development of the powers of mind and body.
The law of temperance must control the life of every Christian. God is to be in all our thoughts; His glory is ever to be kept in view. We must break away from every influence that would captivate our thoughts and lead us from God. We are under sacred obligations to God so to govern our bodies and rule our appetites and passions that they will not lead us away from purity and holiness, or take our minds from the work God requires us to do.
Those who serve God in sincerity and truth will be a peculiar people, unlike the world, separate from the world. Their food will be prepared, not to encourage gluttony or gratify a perverted taste, but to secure to themselves the greatest physical strength, and consequently the best mental conditions. . . .
Our heavenly Father has bestowed upon us the great blessing of health reform, that we may glorify Him by obeying the claims He has upon us.... The harmonious, healthy action of all the powers of body and mind results in happiness; the more elevated and refined the powers, the more pure and unalloyed the happiness. ML 125
As the Son of man, [Jesus] prayed to the Father, showing that human nature requires all the divine support which man can obtain that he may be braced for duty and prepared for trial. Pr 19
You should know that your body is a temple for the Holy Spirit who is in you. You have received the Holy Spirit from God. So you do not belong to yourselves, because you were bought by God for a price. So honor God with your bodies. 1 Corinthians 6:19-20 (New Century Version)