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Prof Graham Finlayson, Chair in Psychobiology, University of Leeds, said it was reasonable to be cautious, especially in children, but the evidence wasn't strong enough to dismiss non-sugar sweeteners as a tool for reducing sugar intake.

Importantly, this doesn’t mean that children with these differences in anatomy will inevitably go on to try drugs, said Dr. Bertha Madras, a psychobiology professor at Harvard Medical School, who was not involved with the study either.

"This paper is important because it provides, for the first time, evidence of the existence of a link between frailty in older adults and intensity of the response to T. gondii infection," said co-author Blanca Laffon, a professor of psychobiology at the Interdisciplinary Centre of Chemistry and Biology at University of A Coruña.

According to Dr. Martin Picard, Ph.D., associate professor, and director of the Mitochondrial Psychobiology Group at Columbia University Irving Medical Center in New York, "stress experiences will naturally affect our biology. Our body will have very real psycho-biological responses."

“The findings are both intriguing and sobering,’’ said Bertha Madras, a psychobiology professor and researcher at Harvard Medical School.