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Introduction: There is a need for greater scientific attention to research on violence (e.g., insults, intimidation, beatings) in contexts where such behaviors are prevalent. The agonizing win-lose vision that oftentimes is characteristic of sports competition is not understood in the same way in grassroots sports as in professional sports. Although increasingly frequent, the federative systems for young athletes replicate professional competitions, and the agonizing win-lose vision and psychosocial agents that characterize sports competitions do not impact grassroots sports in the same way as in professional sports. The present study aimed to establish a predictive model of the influence of exposure to violence in initiation sports on peer social relations under competitive situations in young athletes., Method: Through a descriptive, non-randomized, and associative study, a sample of 503 young athletes (M age = 14.76 1 ± 72 years; 54.80% girls) was recollected, belonging to different Spanish sports centres who completed instruments designed to identify their exposure to violence, prosocial and aggressive tendencies among peers, and competitiveness., Results: The results show that increased exposure to violence in sports amplifies those effects that excessive motivation for success and external influences, increases the likelihood of aggressive behaviors in young athletes (mainly in boys), while the emergence of prosocial skills in both boys and girls reduces aggressiveness and exposure to violent behaviors., Discussion: For this reason, to offer a more than relevant background in reducing the effects of excessive competitiveness in grassroots sport, scientific contributions on the protective efficacy of prosocial tendencies against the emergence of aggressive behavior. In addition, contemplating the sociological analysis of the proliferation of insults, harassment, and violent behavior (e.g., observed behaviors or victimization) experienced in sports at very early ages will allow, in a more applied vision, the convenience of designing more psycho-educational sport practice strategies (e.g., social skills integrated into sports action, fair play) both for young athletes and for those adults who accompany them (e.g., parents, coaches, managers)., Conclusion: Addressing the effects of excessive competitiveness and violence in grassroots sports requires a comprehensive approach involving both sociological analysis and applied psycho-educational interventions., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The reviewer AO declared a shared affiliation with the author MG-L to the handling editor at the time of review. The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision., (Copyright © 2025 González-Hernández, Gómez-López, Carlo and Manzano-Sánchez.)

Breast milk is a fluid of vital importance during the first stages of life of the newborn since, in addition to providing nutrients, it also contains cells and molecules of the immune system, which protect the neonate from infection and, at the same time, modulate the establishment of the microbiota. Bactericidal/permeability-increasing protein (BPI) is relevant in preventing disease and sepsis in neonates. Therefore, the following work aimed to demonstrate the presence of BPI in the different stages of breast milk and its possible immune functions. Our results demonstrate for the first time the presence of soluble BPI and leukocytes and epithelial cells containing it, primarily in the colostrum stage. Using BPI at concentrations typical of colostrum, we observed that it reduces the growth of two distinct E. coli strains, enhances the uptake of these bacteria by monocytes, and suppresses the secretion of the proinflammatory cytokine interleukin (IL)-8 in infected intestinal cells. These findings suggest that BPI transferred via colostrum from mother to newborn may play a significant role in providing antimicrobial and anti-inflammatory protection during the early stages of life.