” Using the model, they found that it may take five days for a person’s circadian clock to acclimate to a six-hour time difference on a trip flying west and six days for a trip east. For older adults, the model predicted it may take seven and nine days respectively.
The model’s predictions echo findings in similar studies on mice, the researchers say. They cautioned, however, that the results depicting a decline in the circadian clock’s ability to acclimate to the new environment as humans age needs to be borne out in clinical trials.”
As a former engineer, I’m always interested in new scientific studies, but I also question hypothesis without clinical trials to support their conclusion. So, I’m curious. For our older travelers, how many days do you personally feel that it takes to acclimate? 1-2 days, 3-4, 5-6 or 7-9?
I’m 66, flying to a 9-hour time difference and experience a 1-2 day range each trip heading to Europe and 3-4 flying back home to the west coast. If their model projection is linear, that would be a week and a half while I was in Europe! (I eat the dinner on the planes and their little breakfast.)