Drinking tea can prevent the incidence of neurocognitive disorders decline in elderly

Researchers have found that regular consumption of tea could more than halve the risk of cognitive decline for the elderly people.

Many studies have already looked at the health benefits of tea: benefits to the bones or to the heart . The latest study, led by researchers at the University of Singapore, suggests that regular consumption of tea could reduce the risk of cognitive decline in the elderly, especially those with a genetic risk of Alzheimer's disease .

The researchers reached this conclusion by collecting data from 957 Chinese adults aged 55 and over.

Between 2003 and 2005, the team collected information on the participants' drinking of tea (quantity, frequency of consumption, types of tea, etc.). Then every two years until 2010, participants underwent standardized assessments that assessed their cognitive function. The researchers discovered 72 new cases of neurocognitive disorders among candidates between 2006 and 2010.


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UP TO 86% LESS RISK OF COGNITIVE DECLINE

Compared to adults who rarely drank tea, those who consumed it regularly had a 50% lower risk of cognitive decline. In addition, among adults with the APOE e4 gene - which is associated with an increased risk of Alzheimer's disease - those who regularly drank tea had up to 86% less risk of cognitive decline.

The researchers also noted that the benefits on cognitive health were observed among consumers of green tea, black tea, and oolong tea. These benefits would be due to the anti-inflammatory and antioxidant properties of some tea active ingredients that can protect the brain from vascular damage and neurodegenerative diseases.

Drink green or black tea every day is good for the heart

Drink green or black tea every day has a protective effect against cardiovascular disease due to its high content of flavonoids, according to research presented Friday before a congress of cardiology.

"It takes three cups a day for it to be effective," said Anne-Marie Roussel, professor of biochemistry at the University Joseph Fourier in Grenoble (south-eastern France) during the European Days of the French Society of Cardiology held in Paris until Saturday.

Various international studies published in recent years, the tea may play a role in the prevention of diabetes and obesity, but would also reduce the risk of developing various cardiovascular diseases.

At least two studies have reported a reduction in stroke (CVA) ranging from 13 to 23% among regular tea drinkers.


But then it was almost exclusively epidemiological studies, researchers are now working on the mechanisms of action of flavonoids in tea.

Among these include in particular the vasodilator effect "which is at the heart of cardiovascular protection and measurable clinical today," according to Ms. Roussel.

It also cites the altered metabolism of the endothelium, the tissue that forms the inner lining of blood vessels.

Dysfunction of endothelial function is the first step in a process that can lead to stroke, for its part, said Dr. Eric Bruckert, chief of endocrinology and cardiovascular disease prevention at the Pitié -Salpêtrière Hospital in Paris.

By measuring endothelial function, researchers were able to show that certain foods allowed improvement of this function. "For fruits, vegetables and fish, the effects are small, the improvement is more significant for cocoa or wine, but it is the tea that causes the greatest improvement" summarizes Prof. Bruckert.


According to studies, tea was also able to reduce cholesterol and triglycerides (another type of fat) in the blood and act on "insulin resistance" (which translates into less good use of sugar by the body and plays a role in the onset of type 2 diabetes).

But you can not add sugar or milk in his tea, which may destroy or greatly reduce its beneficial effect, warns Ms. Roussel.

As for pregnant women, they should not exceed three cups per day for tea "at very high doses, in some subjects," is likely to hinder the absorption of iron in the body. "As a precaution and common sense, there is no need to drink a liter of tea per day," she adds.