The Healthiest Day

Back in 2014 an interesting study was published in The American Journal of Preventive Medicine and appeared online in Science Direct. A group of doctors examined the Google search queries during a specific period for messages that indicated an interest in personal health. Their study The Healthiest Day reported they had found an heightened interest in personal health concerns on Monday and Tuesday. The report is reproduced below so it can be easily read.

Having made the seven-day week the subject of this blog, I am interested in the work of anyone who investigates this subject. Of course, I accept the outcomes of this report, but I might add interpret the data differently. Monday is the day when we feel things more deeply and Tuesday is the day when we do something about our problems. Hopefully these behaviors are our responses to some deeper social patterns and very possibly provoked by these circasepan rhythms.  And I am extremely happy to hear that some medical professionals recognize that illness may involve weekly rhythms and are searching for new patterns of healing.

The Healthiest Day

Background –  Biological clocks govern numerous aspects of human health, including weekly clocks–called circaseptan rhythms–that typically include early-week spikes for many illnesses.

Purpose – To determine whether contemplations for healthy behaviors also follow circaseptan rhythms.

Methods – We assessed healthy contemplations by monitoring Google search queries (2005–2012) in the U.S. that included the word healthy and were Google classified as health-related (e.g., healthy diet). A wavelet analysis was used in 2013 to isolate the circaseptan rhythm, with the resulting series compared by estimating ratios of relative query volume (healthy versus all queries) each day (e.g., (Monday–Wednesday)/Wednesday).

Results – Healthy searches peaked on Monday and Tuesday, thereafter declining until rebounding modestly on Sunday. Monday and Tuesday were statistically indistinguishable (t=1.22, p=0.22), but their combined mean had 30% (99% CI=29, 32) more healthy queries than the combined mean for Wednesday−Sunday. Monday and Tuesday query volume was 3% (99% CI=2, 5) greater than Wednesday, 15% (99% CI=13, 17) greater than Thursday, 49% (99% CI=46, 52) greater than Friday, 80% (99% CI=76, 84) greater than Saturday, and 29% (99% CI=27, 31) greater than Sunday. We explored media-based (priming) motivations for these patterns and they were consistently rejected.

Conclusions – Just as many illnesses have a weekly clock, so do healthy considerations. Discovery of these rhythms opens the door for a new agenda in preventive medicine, including implications for hypothesis development, research strategies to further explore these rhythms, and interventions to exploit daily cycles in healthy considerations.