Thermogenesis: Heat production not accounted for by resting
metabolic rate or physical activity. Progress by which stored fat
is liberated and mobilized so that it can be burned as a fuel
source. The most popular bodybuilding thermogenic agents are
ephedrine and caffeine. Factors stimulating thermogenesis include
food intake, thermogenic substances (such as adrenaline, some
drugs, some types of food and some herbs), cold exposure and
psychological stress. Thermogenesis normally accounts for around
15% of daily energy expended.