http://www.emaxhealth.com/1020/how-thomas-edison-may-have-contributed-obesity-epidemic

How Thomas Edison may have contributed to the obesity epidemic

By Kathleen Blanchard RN on September 2, 2012 

"A group of University of Aberdeen scientists suggest we’re getting fatter because humans are trying to beat the clock. It seems Thomas Edison’s invention of the light bulb might be contributing to the obesity epidemic and other health problems.
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The authors noted that heart attacks, acute cases of congestive heart failure, hypertensive crises and asthma attacks all peak at a certain time of the day, based on epidemiological study results.

They also note the high rates of obesity, heart disease and metabolic abnormalities among shift workers whose '…normal synchrony between the light-dark cycle, sleeping, and eating is disturbed.'"