 Previous studies suggest increased time spent outdoors is associated with lower body mass index BMI.1,2 . In addition, energy expenditure and hunger have been associated with exposure to heat or cold. Increased usage of central heating and air conditioning systems coupled with increased time spent indoors has created an environment where humans are expending less energy to regulate their body temperature.3 The human thermoneutral zone TNZ is the range of ambient temperatures in which a healthy adult can maintain body temperature without expending energy beyond the normal basal metabolic rate. Energy intake and expenditure are adjusted at temperatures above and below the TNZ.4 The temperature of the food, smell, time of consumption, and number of people present are established factors that influence food consumption in humans.5 In addition, evidence supports the role of the environment upon an individuals food intake. Wall color, lighting, and ambient noise, influence consumption preferences and quantities.6 Based on research in animal models, particularly mice and livestock,food intake and subsequently, weight gain is reduced in high ambient temperatures.7-10 In addition in young, physically active, healthy males, food intake is inversely proportional to TNZ.11 However, energy expenditure increases above and below the TNZ. These studies are based on extreme conditions, therefore there is a lack of information on how small changes in ambient temperature may affect food intake in the general human public. Recent research shows the effectiveness of small changes over time to lead to changes in consumption practices.12 Thus, altering the thermal environment subtly may lead to a greater understanding of long term effects in weight management. The investigators have previously examined the thermal environment of persons going about their daily lives in both urban and rural settings X120217008. Preliminary analysis of the results suggest increased body fat is associated with lower heat exposure. 