I got a blood pressure monitor about a week ago. The men in my family have a history of high blood pressure, but my diet and exercise and body composition has b

I got a blood pressure monitor about a week ago. The men in my family have a history of high blood pressure, but my diet and exercise and body composition has been so dialed in the last six months that I was expecting my blood pressure to be at normal levels. But to my surprise, that wasn't the case. After going cold turkey on my Coke Zero habit and doubling my fish oil intake, I gradually went from 145/85 to around the 120/70 range over the course of a week. I can't know if the drop was caused by those dietary changes. It could have been due to a few days of elevated stress, though that doesn't correspond to my subjective experience. It could have been due to the sodium content in the Coke Zero. It could have been due to the caffeine, except all the research I found states that caffeine intake only leads to a very short-term elevation in blood pressure. But I'm sleeping much more soundly now due to no caffeine, so that might be it. The extra fish oil could also have helped, but it's unlikely to account for most of the drop. Sleep seems like the most likely candidate. I didn't have problems sleeping even when I was drinking a lot of caffeine, but there's no doubt the quality of the sleep was subpar.