Comparison of energy intake with energy expenditure during the 8 h experimental treatment and during the 6 h posttreatment period (as part of a randomized experimental trial). Study participants were Regular Force or Class A Reservists (n = 18). The data presented are for 8 h and 16 h (a total of 24 h) of energy intake and expenditures (39) of CAF personnel participating in the four experimental treatments (sedentary (21 °C), cold (− 10 °C), hot (30 °C) and temperate (21 °C); humidity (~ 30% under sedentary, hot and temperate treatments and 50% in the cold treatment). Energy intake data were collected using the measured food intake/food waste method, where all consumed and/or non/partially consumed food and beverage were weighed and recorded for each participant. Strenuous physical activity consisted of infantry activities during the 8 h experimental treatments (for detailed analyses on energy expenditure, see Mandic et al. ).