**5. Conclusions**

To our current knowledge, this is the first study in which the DII for young Polish people was calculated. The Dietary Inflammatory Index is very promising as it can detect any inflammation depending on the diet one has. Due to its low cost, this method allows for a quick assessment of the quality of the diet and its impact on health. However, additional studies on the relationship with dietary inflammation are needed.

**Author Contributions:** Conceptualization, A.K. and A.P.; methodology, A.K. and A.P.; software, A.K. and D.I.; validation, A.K. and A.P.; formal analysis, A.K. and D.I.; investigation, A.K., A.P. and D.I.; resources, A.K. and A.P.; data curation, A.K. and A.P.; writing—original draft preparation, A.K., A.P. and D.I.; writing—review and editing, A.K., A.P. and D.I.; visualization, D.I.; supervision, A.K.; project administration, A.K.; funding acquisition, A.K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the Ministry of Science and Higher Education (https://www. gov.pl/web/nauka/ accessed on 29 April 2022) in 2020/2022 as part of the Scientific School of the University of Physical Education in Warsaw—SN No. 5 "Biomedical determinants of physical fitness and sports training in adult population".

**Institutional Review Board Statement:** This study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Ethics Committee of Jozef Piłsudski University of Physical Education in Warsaw.

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Conflicts of Interest:** The authors declare no conflict of interest.
