In one study, young breast cancer survivors reported skin sensitivity, vaginal dryness, genital pain, premature menopause, fertility issues and extreme fatigue.

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Because of the sensitivity of the issue, researchers who carried out the study decided to adopt the 'randomised response technique method'.

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Limned with equal sensitivity are two chalk drawings by Paolo Veronese, "Study of a Black Youth Eating" (c. 1580) and "Study of the Head of a Black Man" (c.1573).

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Experts believe that, as Floel's study suggests, increased inflammation and a drop in insulin sensitivity (which is known as insulin resistance) may help explain why obesity and type 2 diabetes have been linked to worse mental performance and a greater risk of Alzheimer's disease.

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Compared to controls, the rats also showed increased sensitivity to stress and produced more of a stress hormone, in a study published in May in a Public Library of Science journal, PLoS One.

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The study focused on head scans since the brain is believed to have heightened sensitivity to radiation.

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