LUNAR RHYTHMS OF THE MEAL AND ALCOHOL INTAKE OF HUMANS

Lunar variations in the nutrient intakes and the meal patterns of huma ns were investigated by reanalyzing the data previously collected by p aying 694 adult humans to maintain a 7-day diary of everything they at e, when they ate it, and their subjective state of hunger. A small but significant lunar rhythm of nutrient intake was observed with an 8% i ncrease in meal size and a 26% decrease in alcohol intake at the time of the full moon relative to the new moon. This effect was present for meals ingested either during the daytime or the evening, indicating t hat nocturnal illumination level was not the critical variable. The re sults suggest that there is a true internal lunar rhythm which influen ces nutrient intakes of normal humans free-living in their natural env ironments.