Saturday, December 3, 2016

Why you should Wear Sunglasses

Reasons to Wear Sunglasses

Reasons to Wear Sunglasses
1.) UV Protection. The sun's UV radiation can cause cataracts; benign growths on the eye's surface; and photokeratitis, sometimes called snow blindness, which is a temporary but painful sunburn of the eye's surface. Wide-brimmed hats and caps can block about 50 percent of UV radiation from the eyes but optometrists say that is not enough protection.
2.) Blue-Light Protection. Long-term exposure to the blue and violet portion of the solar spectrum has been implicated as a risk factor for macular degeneration, especially for individuals that are “sun sensitive.”
3.) Comfortable vision. The sun's brightness and glare interferes with comfortable vision and the ability to see clearly by causing people to squint and the eyes to water.
4.) Dark adaptation. Spending just two or three hours in bright sunlight can hamper the eyes' ability to adapt quickly to nighttime or indoor light levels. This can make driving at night after spending a day in the sun more hazardous.
5.) Skin Cancer. Cancer of the eyelids and skin around the eyes is more common than people think. People should wear sunglasses outdoors whether they are working, driving, participating in sports, taking a walk, running errands or doing anything in the sun.
Five Tips for Healthy Eyes
1.) Wear protective eyewear any time your eyes are exposed to UV light, even on cloudy days and during winter months.
2.) Look for quality sunglasses that offer good protection. Sunglasses should block out 99 to 100 percent of both UVA and UVB radiation and screen out 75 to 90 percent of visible light.
3.) Check to make sure your sunglass lenses are perfectly matched in color and free of distortions and imperfections.
4.) Purchase gray-colored lenses. They reduce light intensity without altering the color of objects, providing the most natural color vision.
5.) Don’t forget protection for children and teenagers. They typically spend more time in the sun than adults.
Source: American Optometric Association

Friday, February 21, 2014

How T-cells go down if you are sleep deprived

Produce More T-Cells and Develop Strong Immune System

Helper T cells are actually quite important and interesting. They are activated by Interleukin-1, produced by macrophages. Once activated, Helper T cells produce Interleukin-2, then interferon and other chemicals. These chemicals activate B cells so that they produce antibodies. The complexity and level of interaction between neutrophils, macrophages, T cells and B cells is really quite amazing.

Sleep and Immunity: Understanding the Link

Not getting enough sleep has been linked to a laundry list of mental and physical health problems, including those that stem from an impaired immune system. Our immune system is designed to protect us from colds, flu, and other ailments, but when it is not functioning properly, it fails to do its job. The consequences can include more sick days.
The relationship between lack of sleep and our immune systems is not quite as straightforward as mom made it out to be, however. The immune system is pretty complex. It is made up of several types of cells and proteins that are charged with keeping foreign invaders such as colds or flu at bay.
“A lot of studies show our T-cells go down if we are sleep deprived,” Balachandran says. “And inflammatory cytokines go up. ... This could potentially lead to the greater risk of developing a cold or flu.”
In simple terms, sleep deprivation suppresses immune system function. Or, as Balachandran puts it, “The more all-nighters you pull, the more likely you are to decrease your body’s ability to respond to colds or bacterial infections.”

Lack of Sleep and Fevers

Sleep loss not only plays a role in whether we come down with a cold or flu. It also influences how we fight illnesses once we come down with them.
For example, our bodies fight infection with fevers. “One of the things that happens when we sleep is that we can get a better fever response,” Balachandran says. “This is why fevers tend to rise at night. But if we are not sleeping, our fever reaction is not primed, so we may not be waging war on infection as best we can.”

Lack of Sleep and Vaccines

Studies have shown that people who are sleep deprived also get less protection from flu vaccines than those who are getting adequate sleep, Balachandran says.
John Park, MD, a pulmonologist who specializes in sleep medicine at the Mayo Clinic in Rochester, Minn., agrees. “We know that our immune response is suppressed when we are sleep deprived and that we develop less antibodies to certain vaccines if we are sleep-deprived,” Park says. “It takes longer for our body to respond to immunizations, so if we are exposed to a flu virus, we may be more likely to get sick than if we are well rested when vaccinated.”
"There are two major types of MHC protein molecules--class I and class II--that span the membrane of almost every cell in an organism. In humans these molecules are encoded by several genes all clustered in the same region on chromosome 6. Each gene has an unusual number of alleles (alternate forms of a gene). As a result, it is very rare for two individuals to have the same set of MHC molecules, which are collectively called a tissue type. MHC molecules are important components of the immune response. They allow cells that have been invaded by an infectious organism to be detected by cells of the immune system called T lymphocytes, or T cells. The MHC molecules do this by presenting fragments of proteins (peptides) belonging to the invader on the surface of the cell. The T cell recognizes the foreign peptide attached to the MHC molecule and binds to it, an action that stimulates the T cell to either destroy or cure the infected cell. In uninfected healthy cells the MHC molecule presents peptides from its own cell (self peptides), to which T cells do not normally react. However, if the immune mechanism malfunctions and T cells react against self peptides, an autoimmune disease arises."

Sleep Loss: A Life and Death Issue

Sleep loss also plays a roll in our ability to fight off serious health conditions. Research suggests that sleep-deprived people are at higher risk of dying from heart disease, according to Balachandran. “The more sleep loss, the higher your levels of C-reactive protein (CRP) will be,” he says. CRP is a marker of inflammation, and inflammation may play a role in heart disease.
People who sleep less are actually more likely than their well-rested counterparts to die from all causes. “Studies show that people who get about seven hours of sleep a night have the best survival, and if we get less than six hours of sleep a night, our mortality seems to increase,” Balachandran says.

Fighting Illness: How Much Sleep Do You Need?

It appears that some people may do better on less sleep than others. “If you have a strong immune system, it may take longer for you to get run down if you are not sleeping,” says Susan Zafarlotfi, PhD, clinical director of the Institute for Sleep and Wake Disorders at Hackensack University Medical Center in New Jersey. “Some people may be able to drink a cup of coffee from Starbucks or Dunkin' Donuts and readjust. But if you have a weak immune system, you will likely be more prone to infection if you are not getting enough sleep.”
But Balachandran says the bottom line is this: “We live in a 24-7 society and everyone has two jobs and is bombarded with media. So sleep seems expendable. But proper sleep is a fundamental component of a healthy lifestyle.”

How to Get Enough Sleep

Balachandran offers some sleep hygiene tips for better health. “Go to sleep at the same time every day and wake up at the same time,” he says. “Make sure that your bedroom environment is well-suited for sleep. This means shutting off the computer and TV before bed.”
If you aren’t getting adequate sleep, Park says the most important question is: why?  “Is it by choice or necessity, or because you physically are unable to sleep?” he asks. “If you physically can’t sleep due to insomnia or another underlying health problem, visit your doctor or a specialist to see what treatments are available.”
Treatment may include medications and sleep hygiene tips such as avoiding caffeine after lunch, not consuming alcohol within six hours of your bedtime, and not smoking before bed. You may also learn relaxation and cognitive behavioral therapy techniques for changing actions or thoughts that may be hurting your ability to sleep. 

Why switching off your mobile phone in bed could cure your bad BACK

  • Changing simple bedtime habits could cure back pain according to study
  • Poor rest increases proteins in the blood and sparks inflamatory reaction
  • Cutting out stimuli like a smartphone said to help get better night's sleep
A bad night’s sleep is always likely to put you in a foul mood but studies show lack of rest can also leave you plagued with pain.

Now experts believe that changing bedtime habits could be the key to healing a long-standing problem.

A study has found that people who don’t get enough sleep are up to 66 per cent more likely to be plagued with pain.

Poor rest increases levels of proteins in the blood which spark inflammatory reactions in the body.

Academics from the Norwegian University of Science and Technology in Trondheim made their discovery after reviewing the health data of thousands of people who were monitored for more than a decade.

Dr Adam Al-Kashi, head of research and education at the charity Back Care, said: ‘Having a bad back is clearly a vicious cycle. The pain can keep people awake at night, which, in turn, gives them pain.

‘In those circumstances, people often can’t work or can develop depression; it can affect every part of a person’s life.
‘Improving sleep quality is perhaps one way to break that cycle. 

‘Quite often, people will have a smartphone glued to their hand in bed or under their pillow so they can check their emails and texts 24/7.

‘It would be good practice to cut out that kind of stimulus in the last few hours before lights-out so that the mind is calm and relaxed.

‘Low levels of ambient light can also disrupt sleep so your bedroom should pretty much be in black-out.
‘Studies have shown that having a cold shower can improve sleep quality. 

These are all things that people can try.’

Many of us carry on using mobile phones and other gadgets while in bed
The latest report in the European Journal of Public Health examined the cases of more than 27,000 Norwegian men and women.

All were selected because they did not suffer from chronic back, neck or shoulder pain, however, they were categorised according to their sleep habits.

Eleven years later, they were quizzed again to discover if any particular group was more at risk of developing a bad back.

Women who occasionally had trouble sleeping were now 32 per cent more likely to suffer chronic lower back pain than those who always slept soundly.

That figure rose to 66 per cent for those who often tossed and turned into the small hours.

For men, the added risk was 30 per cent and 51 per cent respectively.

Similar patterns were seen for pain in the neck and shoulders with the worst sleepers 53 per cent more likely to suffer among females and 58 per cent among males.
Risk was partly reduced for those who exercised regularly and avoided obesity.

The study states: ‘The findings provide convincing evidence that sleep problems represent an independent risk factor for chronic musculoskeletal pain.

‘A possible mechanism may be that poor sleep induces a state of low-level systemic inflammation that contributes to sensitize the [pain receptor] system.
‘Experimental studies have shown that sleep deprivation induces elevated plasma levels of pro-inflammatory cytokines [proteins used by the immune system]. 

‘It has been shown that elevated levels after sleep restriction are strongly associated with increased pain ratings in healthy individuals.’

It adds: ‘Given the high proportion of people at risk of chronic pain due to sleep problems, this is an important target group for community-based measures aimed at reducing the incidence of chronic pain in the low back and neck/shoulders. 

‘Our results indicate that such measures should include promotion of regular physical exercise and maintenance of normal body weight.’

In 2011, it was estimated that around 7.5 million Britons suffered from chronic back pain and a third of those would never recover.

Four in every five problems are non-specific which means that they cannot be cured by healing an injury.