You've got to stay regular. It's better to have things ticking over so that the whole system remains in motion than to stay constipated for long periods, resulting in the physically and mentally traumatic effects of passing a giant shit. Such a gargantuan, submersible monstrosity is often the effect of prolonged phases of procrastination and inactivity. There is also another danger that lies in wait, and that is the temptation to attempt an indefinite delay to the inevitable. In this case the shit builds up internally to such high concentrations that it has no other recourse but to exit its host by any available means. In order to avoid such antisocial discomforts, the artist maintains a silver thread throughout every moment in life, a thread that beckons to the creative spark, urging gently, sometimes longingly to scale the heights in search of vistas ever new. This thread shines in our memory, reminding us of experiences that although having receded from the now, still hold immense power when revived by our "magic art". Such an artist never "dries up", only goes slowly (sometimes not so slowly) mad or dies inside, leaving but a shell of what was once the crown of creation. Having exploded in an eruption of stored up logs or faded away, poisoned by the retention of toxins, these poor souls were martyred upon the cross of their art for want of a simple daily evacuation.
But wait, let us pause to reflect. For some it may be a simple matter through force of habit, maturity of character or strength of will, for others the discipline involved in order to maintain a healthy output does not come so naturally and is either learned the hard way through bitter experience or development and execution of a steadfast resolve. We are not so much talking about the relative input here, although that would be an interesting topic in itself, I will concentrate for the now upon the digestion (which replenishes the finer body of the artist) and the process of materialization of the art.
A "varied diet" is a good starting point. More explicitly, I take an alternating approach to the first phase of drawing. If I have finished a work that began as a concrete idea or set of ideas I will often start the next piece with some free-drawing to inject a fresh influx of inspiration, and so on, alternating so as to create a kind of feedback loop over a period of time. Some people swear by the apothecary and proclaim the efficacy of self medication or micro-dosing, but I leave that for others to expound upon as I believe it is the same with all laxatives, that one must exercise caution and common sense if one is to maintain a sense of dignity and decorum. Alas, who has dignity anymore these days(?)... not even the Queen(!)
But the Queen does poop, and as sure as the Queen poops the artist must seize the urge to squeeze out a drawing, a song, an idea for a play or to continue on the work in hand. The artist is verb, in this way [is=does]. This is why most shit art is created by shit artists. However, other artists, mediocre, good and excellent will occasionally make shit art, but in such instances it is often recognized as such and either buried or left to die of natural causes.