Spring, summer, autumn, and winter. The four seasons have their different characteristics very marked, but in reality, to our body there are only two. It is the result of a recent study in the United States.

Researchers from the Stanford University have analyzed more than 1,000 molecules that circulate in the bloodstream. Their findings, published by Nature Communications, are that the organism only distinguishes between two seasons, a warm and a cold one.

According to Michael Snyder, the study director, the goal was to know if there are changes in the levels of different molecules in the human body periodically and with this knowledge, improve medications depending on the time of year.

The researchers collected four years of data on the molecules from 105 individuals. The experts saw that the oscillations of the molecules do not correspond to the usual pattern of the four seasons, but that there are two points of inflection, one at the end of spring and beginning of summer and others in late fall and early winter.

Thus, at the end of spring, inflammatory biomarkers increase, related to allergies, or an increase in the molecules involved in osteoarthritis or rheumatoid arthritis. Peaks were also recorded in molecules that affect type 2 diabetes.

And in the so-called cold season, the researchers detected an increase in immune molecules in the development of acne, in response to viruses or hypertension.