ABSTRACT
Conclusions 80
References 81
INTRODUCTION
Methylxanthine (MTX) consumption is one of the most common customs in the world, occurring in most every society and culture (James, 1991; Barone and Roberts, 1996). Methylxanthines, which include caffeine, theophylline, and theobromine, can be found in a variety of different forms, including coffee, tea, mate, cola beverages, and pharmaceutical and nutritional products, all of which contain different concentrations of distinct MTXs (James, 1991; Barone and Roberts, 1996).
