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Some other elements of nutrition are becoming more essential, such as ensuring good health and preventing illness, in addition to providing the required nutrients for growth and development. The content and safety of food items are of particular concern in the highly processed food industry. Food poisoning, obesity, allergies, cardiovascular disease, and cancer—the 21st-century plague—are all serious issues that need attention to food quality. Probiotics and prebiotics may have a positive impact on a person's health, according to scientific studies. A diverse community of bacteria lives in the human gastrointestinal tract. In addition to coexisting with their host, commensal intestinal bacteria also go through a process known as symbiotic co-evolution. Bacteria that live in the intestines have a wide range of tasks, including producing nourishment for the host, protecting the body against intestinal pathogens, and regulating the immune system. Lactobacilli and bifidobacterial, in particular, are stimulated to proliferate by prebiotic oligosaccharides, which are not digested by humans. Prebiotics are being studied in numerous clinical studies to see what effect they have on human immunity.