Having a younger brother can increase a person's blood pressure by 3 to 5.9%, while a younger sister "just" increases an individual's blood pressure by around 3.8%. This physiological change can lead to the development of hypertension and increases a person's risk of cardiovascular disease, heart attacks and heart attacks, according to a new scientific study. The good news is that as a person gets older, the effects of having a younger brother or sister gradually wear off .
The authors of the work, researchers from Brandeis University (USA), attribute the finding to the fact that older siblings receive less attention from their parents when a younger one arrives. "Siblings' birth order, number, age, and sex are associated with the distribution of parental resources to each child, and this affects well-being," the authors explain in the journal Economics and Human Biology .
