ï»¿courts on neighboring rooftops, and men working just outside her window. She does not recognize any of the people she sees, and they continue whatever they are doing without paying any heard a vague chanting, of the sort he thought might be associated with an Indian temple. internal experiences, from the cross-hatchings of prehistoric cave paintings to the swirling psychedelic art of the 1960s. Do thearabesques and hexagons in our own minds, built into our brain The only thing missing from this hypothesis as it was originally conceived a century ago, or as reconceived by Pennington and then Bruch and Astwood, was an explanation for the epidemiological observations. In other words, obesity may be caused by a hormonal or metabolic defect determined primarily by genetic inheritance, but the epidemiology tells us that this defect is triggered by environmental factors. Genetics determines our propensity to put on weight, but those genes (nature) have to be triggered by an agent of diet or lifestyle (nurture) to explain the association of obesity with poverty, the present obesity epidemic, and the emergence of obesity in recently Westernized populations. A change in the environment is also necessary to explain why man alone seems to grow chronically obese, not other species of animals.Something has happened in the past twenty, thirty, forty years in the incidence of obesity, and that has to be environmental, as George Cahill has said about the present obesity epidemic.