Elderly women should eat broccoli, cauliflower and Brussel sprouts to reduce their risk of stroke, study finds

Women who eat broccoli, cauliflower and Brussel sprouts are less likely to suffer strokes, research shows.

Those who ate three or more portions of any types of these vegetables a day had much healthier blood vessels, according to Daily Mail.

The study also found that the 'cruciferous' group vegetables were particularly beneficial.

These include broccoli, cauliflower, kale, turnips, sprouts, bok choi and greens.

How exercise in old age prevents the immune system from declining

Doing lots of exercise in older age can prevent the immune system from declining and protect people against infections, scientists say.

They followed 125 long-distance cyclists, some now in their 80s, and found they had the immune systems of 20-year-olds, according to BBC.

Prof Norman Lazarus, 82, of King's College London, who took part in and co-authored the research, said: "If exercise was a pill, everyone would be taking it.

"It has wide-ranging benefits for the body, the mind, for our muscles and our immune system."

Scientists explain the sound of knuckle cracking

Scientists have turned their attention to investigating that most annoying of human habits - the sound made when you crack your knuckles.

The characteristic pop can be explained by three mathematical equations, say researchers in the US and France, according to BBC.

Their model confirms the idea that the cracking sound is due to tiny bubbles collapsing in the fluid of the joint as the pressure changes.

Three cups of coffee a day clears out the arteries and protects against heart disease, reveals study

Drinking three cups of coffee a day could help clear out your arteries, according to a new study.

The scientists found that people who drank more coffee each day had less 'calcified' arteries - meaning fewer calcium deposits on the aortic valve in their hearts, according to Daily Mail. 

'In our research, we found that habitual consumption of more than three cups a day of coffee decreased odds of coronary calcification', the study author, Andreia Miranda, said. 

Having more than three cups a day was found to most effective - although, the researchers warn, much more than that might be unhealthy.

Why we struggle to get good night's sleep as we get older

New research has identified the way age impairs the ability of the circadian clock in mammals to re-set itself when exposed to light, resulting in disruption to sleeping patterns and consequent threats to wellbeing, according to Science Daily.

Researchers found that aging results in a significant reduction in sensitivity to light in the part of the brain that controls circadian rhythms, known as the suprachiasmatic nucleus (SCN).

The breakthrough could help target treatments that aim to improve both physiological and behavioural circadian clock’re-setting' in older people.