Coffee has a debilitating effect on both the middle and lower burners. Spleen yang is chilled and kidney yin and yang are exhausted by the consumption of coffee. Using coffee as an energy boost is like continually dipping into one’s savings or capital. Eventually such profligate deficit spending leaves one’s internal economy bankrupt.

Further reading:

The China Study: The Most Comprehensive Study of Nutrition Ever Conducted and the Startling Implications for Diet, Weight Loss and Long-term Health by T. Colin Campbell, Thomas M. Campbell II, John Robbins, and Howard Lyman.