James 2:14,16-17 says,
“What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him?  And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit?  Even so faith, if it hath not works, is dead, being alone.”
My friend, most of the ‘faith’ that’s talked about these days is nothing more than junk food. Yes, you heard me right. Junk food is cheap food containing high levels of calories from sugar or fat but with little fiber, protein, vitamins or minerals. Same is the kind of the spiritual food we get these days it’s like high protein food, e.g. meat prepared with saturated fat which is unhealthy.
Junk foods, on a long run poses for you negative health effects, especially obesity, heart disease, type 2 diabetes, hypertension, cancer, etc. It’s possible, rather is a fact that those believers relying on spiritual junk food will also have negative spiritual health effects.
Apostle James suggests for us that we give others “things which are needful to the body” not faith, which being alone is dead. “And God is able to make all grace abound toward you; that ye, always having all sufficiency in all things , may abound to every good work.” 2 Corinthians 9:8
Anyway, I wouldn’t say reading one verse alone and then exegetes for hours is giving others what’s needful to the body. A healthy diet is one that helps to maintain or improve overall health.
Taste the good word of God
I like Hebrews 5:11-14
 Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.  For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.  For every one that useth milk is unskilful in the word of righteousness: for he is a babe.  But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
What that means is you need a balanced diet; “…grow up into him in all things…”
1 Peter 2:1-3 says, “Wherefore laying aside all malice, and all guile, and hypocrisies, and envies, and all evil speakings,  As newborn babes, desire the sincere milk of the word, that ye may grow thereby:  If so be ye have tasted that the Lord is gracious.”
Ephesians 4:15-18,20-24 KJV
 But speaking the truth in love, may grow up into him in all things, which is the head, even Christ:  From whom the whole body fitly joined together and compacted by that which every joint supplieth, according to the effectual working in the measure of every part, maketh increase of the body unto the edifying of itself in love.  This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,  Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:  But ye have not so learned Christ;  If so be that ye have heard him, and have been taught by him, as the truth is in Jesus:  That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts;  And be renewed in the spirit of your mind;  And that ye put on the new man, which after God is created in righteousness and true holiness.
A healthy diet provides the body with essential nutrition: so does the word of God that’s unadulterated.
The requirements for a healthy diet can be met only from the inspired word of God. “We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: “Knowing this first, that no prophecy of the scripture is of any private interpretation.  For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.” 2 Peter 1:19-21
A healthy diet supports energy needs and provides for your spiritual nutrition without exposure to toxicity or excessive weight gain from consuming excessive amounts of what false prophets teach. “For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.” (Jude 1:4). Some of those you call prophets are condemned convicts; “…were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness…”
“Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall.” 2 Peter 1:10