There are a few ways to analyse the phrase: "Givin' up Food for Funk." First of all, there's the idea that you're forgoing nutrition, physiological needs, for the needs of the soul, for music. This fasting is also associated with both Eastern ascetic traditions as well as acid and other hallucinogenic trips. When you're tripping you're good with water, Vitamin C and cigarettes. Okay, "a few" is inappropriate. I can only remember one other way this phrase might be employed. And that is, you're not just going for a short-term solution; you're making a life decision in the direction of soul and spirit, art and ecstasy, the higher things in life. You're reading Proust while smoking Dunhills and partying with Keith Richards, Snoop Dogg and Beck.
Wait, now I remember the other meaning. Giving up food for funk = bartering. Just drop some funk on me and I'll give you a square meal. Unless you can subsist soley on funk, in which case, problem solved. Or it could have some other meaning that is obvious to those in the know and I am merely demonstrating my uncoolness with my speculation.