Summary of recent studies about postprandial endotoxemia in lean, overweight or obese men (Laugerette et al., 2011, 2014; Vors et al., 2015). Upper panel: lean to overweight subjects were submitted to the same postprandial test before and after 8 weeks of overfeeding. Lower panel: lean and obese subjects were submitted to two different postprandial tests varying by the amount of fat in the meal.