I Shrunk

 I shrunk. I went to get my annual physical check-up, and I came out 6 centimeters shorter than I thought I was going in. From 188 cm to 182cc! I might lose another 6 centimeters if I am lucky enough to continue to age. It’s mainly in my torso, as what has shrunk is the soft tissue in between my vertebrae in my spine. There are 33 of them, all stacked one on top of the other. In humans, the 24 upper vertebrae are separated by discs that allow movement, while the 9 lower vertebrae are fused. Usually, these discs shrink because of osteoporosis, but in my case, it is pure aging. The discs lose some of their moisture and shrink as we age. We become drier. A human embryo is about 90 percent water, a newborn child about 80 percent, a mature adult about 70 percent, and an older adult about 60 percent water, while those between 70-80 years of age are only 50 percent water. I wonder what water percentage a 100-year-old would have.

Driving home from the clinic, as I was thinking how lucky I am to be able to enjoy aging, despite shrinking, I remembered the Aristotelian view of aging. I use this example with my students. Aristotle defined aging as a natural, inevitable process of becoming cold and dry, characterizing it as a "natural disease" and the gradual extinction of innate heat. He believed life requires warmth and moisture, but over time, the body’s "innate heat" diminishes due to the consumption of "radical moisture" or fuel. If you believe that you get old because you are drying out and losing heat, then the therapy that would reverse this is a sauna. Which is why hot baths were so popular in the gymnasiums during Roman times. They believed that this method of moisturizing rejuvenated the lost moisture and heat. 

Romans followed a ritualized sequence: beginning in the tepidarium (warm room), moving to the caldarium (hot, steamy room), using the laconicum (hottest dry room), and finishing in the frigidarium (cold plunge). Recent studies have supported these beliefs. In a 2017 study on a Finnish male population, Tanjaniina Laukkanen and his colleagues reported that moderate to high frequency of sauna bathing was associated with lowered risks of dementia and Alzheimer's disease. In a review, the same researcher reported that saunas are linked to several health benefits. These include a reduction in the risk of heart diseases such as high blood pressure, cardiovascular disease, and pulmonary diseases, as well as less arthritis, headache, and flu. Maybe Aristotle was onto something when he identified water as the giver of life. But as we get older, we do not feel as thirsty as we did when younger and therefore drink less. This results in less water around our cells and points to an increased risk for dehydration. 

Japanese culture is also centered around the bath, more so than just cleanliness. So, we expect to see this advantage reflected in life expectancy. Finnish life expectancy at around 81-82 is less than Japan’s 84-85. Although moisture might be a contributing factor to long life, there are other things that promote long life. While we all ponder this, remember that we are still shrinking, and although some might also experience reduced spinal mobility because of this dryness, it does not have to restrict mobility. There are things we can do to remain active, stay hydrated, and enjoy our shrinking lives.