The article analyzes Russian and foreign publications from Medline, the US National Library of Medicine, and PubMed, a biomedical and life sciences database. It is indicated that people under increased physical activity can improve their diet by taking functional foods. The paper describes the impact of functional foods on the health of people whose occupation is associated with increased physical activity. Functional foods are supposed to reduce fatigue and restore physical performance under excessive physical exertion. Functional foods are recognized to be beneficial if included in the military nutrition. It has been proven that functional foods boost the immune system, improve stamina, adaptive processes under extreme conditions, physical and cognitive performance under combat stress.