Diseases change the way a body works, says Yehuda Zeiri, PhD, a biomedical engineer at Ben-Gurion University’s Kiryat Bergman Campus in Be’er-Sheva, Israel. “When disease leads to enhancement of new and different biochemical processes in the body, these processes may lead to the production of small volatile molecules,” he explains. “These [molecules] can be transported by the blood to the lungs and be released in exhaled breath; they can also be released in the urine and sweat.”
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