Recently, I went on a vacation to the US Virgin Islands. When I left Paradele, it was early spring, so it still felt like late winter. On the island it was summer. When I returned home, I wondered how my body and mind must have reacted to this leap ahead and back in seasons.

People who spend a great deal of time outdoors become “outdoor acclimatized.” These persons are affected less by heat or cold extremes because their bodies have adjusted to the outdoor environments. Acclimatization usually occurs over a period of about two weeks in healthy, normal persons
On the winter side of things, similar to other animals, the human body naturally transforms to undergo an insulin-resistant state. This aids our system to be more fuel-efficient and optimally perform for extended periods of time with a small amount of food. This is a natural occurrence during seasonal changes in all vertebrates. This survival mechanism has been going on for almost 400 million years of evolution. It’s clear how important it is to regulate our metabolism. When seasons change, our brain sends signals to our body to increase its insulin resistance. Our liver can boost fat production, and our adipose and non-adipose tissues can store fat to prepare for winter.
The command-and-control area of the brain is located deep in the spot between our eyebrows, close to the hypothalamus. This low brain area, which maintains the hypothalamic dopamine activity, is vital for maintaining the insulin-resistance state. It may sound weird, but a decreased level of dopamine activity has also been discovered to be associated with obesity and Type 2 diabetes. For certain people, this annual cycle of insulin resistance turns back to an insulin-sensitive state usually during late winter and early spring to prepare for the summer season and the abundance of food.
And what about our brain’s reactions? Scientists have long believed the brain is vulnerable to seasonal shifts. For instance, headaches are more frequent in the fall and spring, mental health may decline during winter, and some symptoms of brain diseases such as multiple sclerosis vary with the seasons. If a change of season affects your mood, you may also experience a loss of appetite, low motivation, and a change in sleeping patterns.

It is believed that less sunlight can affect the production of serotonin and melatonin in some people, which can cause difficulties with sleep and mood [Seasonal Affective Disorder SAD]. Serotonin production depends on daylight. Melatonin (for sleep) is triggered by the darkening of the day into night but the process actually starts its cycle when you wake p and encounter daylight. Negative shifts in production usually occur when you move into autumn and winter and spend less time outdoors and in sunlight. Of course, that’s not the case for people who live in St. John kinds of tropical climates, or for people who are outdoors during the day in the colder months anyway. Though those people may not be exposing much skin to sunlight, it often affects us through the eyes.
The longer spring and summer days allow more endorphin, testosterone, and estrogen to be released. It has been suggested that this seasonal readjustment of hormones stresses our bodies and we react with a feeling of tiredness.
My reading on all this seems to indicate that it takes about two weeks for the brain and body to adjust. My ten days of summer on the island weren’t enough to go into summer mode, but it must have had an effect on me. And then the return to cold weather must have flipped the switch back.
I never feel affected by the setting back or forward of clocks as happens to some people. I do feel drawn to water in spring and summer. Are you feeling any spring fever this week? How about cabin fever?
We had some summer weather for a week this April in Paradelle. temperatures in the high 80s. People out in short pants and T-shirts. People sitting outside at cafes. Then the following week, it was back to the low 40s. This weekend, I had to pull in my flats of seedlings because at night it was in the low 30s.
Oh, my poor brain and body. What are these seasons doing to you?