To determine caffeine consumption a questionnaire which sought to investigate eating habits was applied. The participants have to include for each item (coffee, teas, soft drinks, chocolate, powdered chocolate, powdered guarana, food supplements and energy drink) the amount, kind (i.e. espresso, filter coffee) and brand. Based on these data, the consumption was calculated using a preview standardization. From there, the subjects were classified according to consumption: sporadic (less than 100mg), light (100 to 299mg), moderate (300 to 499mg). Those who had higher intakes equal to 500mg / day or more (heavy or very heavy) were excluded.