If we look at the image below we can see that there is a strong hormonal variation during 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 by which we tend to gain weight especially during the winter months.
Summer
In the summer months there is a peak of secretion of the 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.
Furthermore testosterone, the male hormone par excellence, has among its many functions that of stimulating libido in both sexes. An increase in sexual stimuli in this period was intended to give birth to offspring nine months later, namely in spring and early summer, a period in which food availability was higher.
Obviously these are not the only reasons that explain the hormonal variations during the year. Indeed, at the base of these changes there are much more complex physiological mechanisms, which can however be traced back in some way to the reasons given in this article.
