If we look at the image below we can see that there is a strong hormonal variation over the course of the year.
Responsible for this mechanism is the so-called "internal clock", a sort of control center that regulates our biological rhythms.
Winter
In the winter months, the human body produces greater quantities of cortisol, a hormone that favors the accumulation of fat, especially in the abdominal region. One of the properties of adipose tissue is to act as a real thermal insulator, protecting the body from the harsh external temperatures. This function, essential for primitive man, has been inherited and explains, at least in part, the phenomenon whereby we tend to gain weight especially during the winter months.
Summer
In the summer months, on the other hand, there is a peak of secretion of anabolic hormones (GH AND TESTOSTERONE) GH, also called growth hormone or somatotropin, and testosterone, are lipolytic hormones and therefore favor the disposal of excess body fat.
In addition, testosterone, the male hormone par excellence, has among its many functions that of stimulating libido in both sexes. An increase in sexual stimuli during this period was intended to give birth to the offspring nine months later, that is in spring. and early summer, a period in which the availability of food was higher.
Obviously these are not the only reasons that explain the hormonal variations during the year. At the base of these changes there are in fact much more complex physiological mechanisms, which can however be traced back in some way to the reasons given in this article.
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