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Green tea can have adverse effects if taken in high doses. Photo: iStockphoto
Green tea can have adverse effects if taken in high doses. Photo: iStockphoto

Too much green tea can be harmful

E-cigarettes and liquids contain chemicals which can lead to serious respiratory issues and lack of sleep can make you grumpystudies and research tips for a healthier you

Lack of sleep causes fatigue and affects mood

Lack of sleep can cause fatigue which affects brain’s ability to regulate emotions, study suggests. Researchers from Tel Aviv University have found that lack of sleep disrupts brain’s capacity for executive functions. The researchers enlisted 18 adults for the study and gave them two rounds of tests in which they had to describe in which direction small yellow dots moved over distracting images, including a cat, a mutilated body and a spoon. When the participants had a good night’s sleep they were able to identify the yellow dots faster and more accurately but when they didn’t sleep they performed very badly. The study was published in the Journal of Neuroscience. Read more here.

Too much green tea can have adverse effects

Green tea can have adverse effects if taken in high doses, a study suggests. Researchers at the University of California found that overconsumption of green tea adversely affected development and reproduction in fruit flies. Whether overconsumption could have the same impact on humans is not clear, but the findings suggest caution when using green tea. The researchers found that larvae exposed to 10mg of green tea developed slowly and were born smaller. Female offspring showed decreased reproductive output and a 17 % reduction in lifespan. In another test on dogs, large amount of green tea dramatically reduced body weight and, in mice, negatively affected embryo development. The study was published in the Journal of Functional Foods. Read more here.

E-cigarettes contain chemicals bad for lungs

E-cigarettes contain a chemical which can cause severe respiratory disease, claims research. The chemical is used in more than 75% of flavoured electronic cigarettes and refill liquids tested for the study. Researchers at Harvard T.H. Chan School of Public Health tested 51 types of flavoured e-cigarettes and liquids sold by leading brands. They found diacetyl in 39 of the flavours, acetoin in 46 and pentanedione in 23 flavours. These compounds can be hazardous when heated and inhaled at over a long period. . “Since most of the health concerns about e-cigarettes have focused on nicotine, there is still much we do not know about e-cigarettes," said lead researcher David Christiani. The study was published in the journal Environmental Health Perspectives. Read more here.

Women’s brain ages better than men

Women cope with mental issues in old age better than men, shows study. However, their bodies do not cope as well. Researchers examined 7,600 people living in Newcastle, Cambridgeshire and Nottingham in 1991 and again in 2011. The found that women’s life expectancy had increased by 3.6 years to 85.3 years in 2011 and so had their capacity to cope with brain related issues. They spent only the last 5.1 years with mild cognitive impairment, which is six months less than the study of 1991. Men’s life expectancy increased 4.5 years to 82.5 but the amount of time spent with memory and thinking problems had increased by four months. The study shows that physical issues arrive later in men in comparison to women. The study was published in The Lancet. Read more here.

Visual concentration leads to temporary deafness

Looking at something attentively impairs the ability to listen, a British study claims. Researchers at the University College London have found that brain’s senses of vision and hearing share a limited processing capacity, which forced it to choose between them. Researchers hired 14 people and gave them some visual tasks while sounds were played in the background. Their brain activity was being monitored. Researchers found that brain’s early response to sound was affected during more visually demanding tasks. “In order to hear, we don’t just need our ears to be operating; we need our brain to respond to the sound," said study author Nilli Lavie. The study was published in the Journal of Neuroscience. Read more here.

Compiled by Abhijit Ahaskar

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