You Are What You Don't Eat.
When thought of in terms of fasting, this is another thought that we might keep in mind when striving for higher HGH levels. That is because fasting has also been shown to increase the levels of HGH in the body.

As a species, we have been subject to fasting throughout most of our history. Prior to the invention of agriculture, obtaining food was a chancy and spotty business. Even after the establishment of agriculture, many people have been subject to bouts of fasting, or at least to periods of low caloric intake. As well, most of the major religions have traditionally called for periods of fasting during particular periods on their religious calendars. Oddly, unless carried to extremes, rather than being harmed by fasting, human beings seem to benefit from fasting. Perhaps being positively impacted by fasting is something of a defence mechanism that has come about because we have been subjected to fasting over the millennia.

The current popular explanation for the perceived beneficial effects of fasting is that fasting allows the digestive system a chance to rest, to eliminate foreign substances, and that fasting allows the body to cleanse itself of metabolic impurities.

Just how fasting tends to promote higher HGH levels is, up to this point, not well understood. Perhaps the theorizing that Jens Sandahl Christiansen has done with regard to the interaction and effect of blood glucose levels, insulin levels, and HGH levels - as they fluctuate after a meal - will offer some clues. For these three factors do appear to be interacting, however directly or indirectly, in some kind of physiological dance.