Author Archives: Amy Puleo

The Rumor About Shaving

I think since before the shaving phase started (or maybe didn’t for some of you… although a 2008 study shows that at least 80-90% of women regularly remove unwanted body hair) many have heard that shaving causes your hair to grow in thicker, darker and faster than before. As No-Shave November approaches, I figured it would be interesting to find out if that’s actually true. 

shaving.jpgWhether leg hair, underarm hair, or facial hair, according to Dr. Lawrence E. Gibson and many other researchers, the rumor is false. Shaving unwanted body hair does not change it’s thickness, color or even the rate of growth. This honestly came as a shock to me because I feel like as I have gotten older, the hair on my legs has started to grow back darker. Up close you can even see small, dark dots where the hair follicle grows even though my hair used to be bleach blonde. My high school track team used to have a competition for competing in No-Shave November and every girl would pay $5 to see who could go the longest without shaving their legs. The winner obviously won all the money. But looking back it’s funny how we would all “save up” the week right before the competition started and refuse to shave. Then the night before November 1st we all shaved our legs, thinking that this process would prevent our leg hair from growing back as quickly as when we shaved every or every-other day.
 

Going into details, the hair follicle, which is located deep under the skin, is what determines thickness and rate of growth. By shaving, we are only cutting off what has grown above the skin and is already dead. A 1970 study used 5 men who, over the course of several months, shaved one leg weekly while leaving the other untouched. The results showed that there was no difference in texture of the hair or rate of growth when comparing the two legs. Dr. Jessica Wu, an assistant clinical professor of dermatology at the University of Southern California Medical School in Los Angeles, says that, “It’s a common belief because when hair grows out naturally, they taper at a sharp point, so they look thinner. However, shaving hair cuts it at a blunt angle so hairs look thicker – you see the cross section of the hair.” A really interesting point I found in an article I read says to think of a long, skinny tree branch. When it’s long, you can bend it because it’s flexible. However, if you were to chop it down to a very short length, it becomes difficult or impossible to bend. Same goes with your hair, which makes it seem and feel courser and thicker. As I said, the rate and color are both dependent on the hair follicle itself which, most of us don’t realize, hair growth often speeds up and color often darkens as we get older. Just as the blonde hair on top of a child’s head often darkens with age, the amount of melanin, the pigment which colors your hair and skin, is what determines this. 
So, the rumor that has been ongoing for over 50 years now and passed down from parents to children and friend to friend is completely false.
http://www.everydayhealth.com/skin-and-beauty/does-shaving-make-hair-grow-back-thicker.aspx
http://www.mayoclinic.com/health/hair-removal/an00638
http://www.todayifoundout.com/index.php/2010/07/shaving-does-not-make-your-hair-grow-back-thicker-or-faster/

What You Should Be Eating for Breakfast

After explaining the many reasons why you should never skip breakfast in my last blog post, I will now go into what that breakfast you are making time for in the morning should consist of. There are so many options for breakfast foods and, personally, they are some of my favorite things to eat. Between cereals, yogurt, fruit, pop-tarts, oatmeal and omelets, what breakfast foods are best? 

Professor of pediatrics and Duke University, Terrill Bravender, says keep a low glycemic index. As I said in my last post, glucose fuels the brain. This glycemic index shows how fast our bodies convert the carbohydrates in our food to fuel. Foods high in sugar are absorbed into our bodies quickly and cause a quick rise in our blood sugar. This spike drops rapidly after a couple hours, leaving us hungry again and it can even release hormones that affect our mood along with concentration. Sugary cereals have a high glycemic index. In other words, stay away from them.
Many researchers highly recommend oatmeal – good thing I just stocked up on a couple more boxes. Although it is similar in the amount of carbohydrates when compared to cereal, it is absorbed slowly into the body so it lasts you the morning and doesn’t cause the spike in blood sugar. Holly Taylor, a psychologist at Tufts University, did a study having children split into two groups and feeding one group sweetened oatmeal for breakfast, while the other ate Cap’n Crunch. The tests they then performed included things like memorizing names of countries on a map. She says that this study showed kids who ate oatmeal did up to 20% better than those who ate Cap’n Crunch. While this is just one study, and as we know correlation does not prove causation, it’s not a bad idea to swap out sugary cereal for oatmeal instead. However, this is not to say that refined grain and whole-grain cereals are not acceptable. Oatmeal has plenty of fiber, including a type known as beta-glucan, which can also help lower cholesterol. A good suggestion is to add some milk, honey and fruit to make your oatmeal even more delicious and nutritious. In general, whole grains and a little protein are a good way to go for breakfast. These are just what you need to give you a boost and keep you satisfied. 
As always, a classic breakfast of eggs is always an excellent way to get your protein. A study done by researches at Pennington Biomedical Research Center compared the weight loss of women who ate either two eggs or a bagel for breakfast every morning. Both foods had the same amount of calories and volume, however, when worked into a diet for overweight women, the egg eaters lost 65% more weight, shrank their waist by 83% and had higher energy levels with no increase in cholesterol levels. 
Overall, great options to combine for your breakfast would be things like whole-grain toast or a whole-wheat english muffin, fruit smoothies with low-fat yogurt, greek yogurt, fresh fruit, oatmeal, an egg or two, and a cup of tea or coffee. There are so many possibilities when it comes to breakfast, just make sure you are actually making time to eat it!
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http://www.webmd.com/diet/features/many-benefits-breakfast?page=2
http://www.npr.org/templates/story/story.php?storyId=5738848
http://www.health.com/health/gallery/0,,20676415_15,00.html

Never Skip Breakfast

Sticking with the topic of starting your day right (my previous two blogs explained the benefits of being an early bird and how you can become one), I’m going to explain why you should never skip breakfast. While I’m sure all of us have heard time and time again how supposedly beneficial eating breakfast every morning is, I can bet that probably over half of you still skip it. It’s sometimes hard, especially with early classes, to get a meal in, but so many companies have made eating breakfast such an easy thing with on-the-go products. Making it to the dining commons might not be an option but keeping things like fruit, oatmeal or wholegrain bread in your room aren’t so difficult. Here’s exactly why breakfast is the most important meal of the day:

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-It provides you with necessary nutrients, vitamins and minerals to start your day off right and keep you satisfied until lunch rolls around. Without breakfast you’re skipping out on these necessities that are so easy to work into your diet through this single meal. 
-Your body fasts all through the night and eating breakfast is the perfect jumpstart to your metabolism.
 
-Breakfast gives you the strength and endurance to get through any physical activity in the morning and prevents you from succumbing to unhealthy snacks before lunch.
-People who eat breakfast have been proven to be leaner. A study done in 2003 and published in The American Journal of Epidemiology tracked 499 peoples’ diets over the course of a year. It showed that people who skip breakfast are 4.5 times more likely to be obese than those who don’t. They are also more likely to have good cholesterol and healthy blood sugar levels.
-Finally, breakfast helps you learn and remember things better. Breakfast helps provide the brain’s fuel – glucose. Researches used 4,000 elementary school students to research the effects of eating breakfast. They first tested short-term memory by reading aloud a series of numbers and having students recite them back. Next, they gave the kids a minute to name all the animals they could think of. In both tests, those who ate breakfast scored significantly better than the students who did not.
I think these results all show how crucial it is to eat breakfast, and I myself have been trying to do a better job of working it into my morning routine. For now it’s usually just a banana on the go or maybe some oatmeal if I have time to make it. The correlation between eating breakfast and obesity seems pretty legitimate but there are so many third variables that could factor into that. Also, since the study for memory was done on elementary school kids’ whose brains are still developing, does it have the same application to adults and older college students? My next question is what exactly is most beneficial to be eating in the morning? What do you all chose to eat? That is, who of us even chooses to make eating breakfast mandatory in the morning? Who is even awake for their first meal of the day to be considered breakfast… 
 
http://www.npr.org/templates/story/story.php?storyId=5738848
http://www.huffingtonpost.com/2012/10/16/health-benefits-breakfast_n_1968248.html#slide=1643897
http://www.jhsph.edu/offices-and-services/student-affairs/_documents/Breakfast
http://www.webmd.com/diet/features/many-benefits-breakfast

How to Become an Early Riser

My most recent blog was on studies showing a correlation between students who wake up early and those who get good grades. You would think that whether you are a morning person or a night person just came with how you were born. Some people just naturally spring out of bed all chipper and ready to go at 7 in the morning, whereas other people can stay wide awake late into the night and sleep most of the day away. I was surprised by how easily I get up for my 8 AM’s now and even on the days when I don’t have class until late afternoon, my body wakes me up around the same time and I start my day productively. “There’s a genetic component to your circadian clock. But for many people, behavioral changes make a big difference,” says New York City psychiatrist Colette Haward, MD. So in other words, if you consider yourself to be a night owl but want to become an early bird (maybe to boost your grades and become more productive with your day), all it takes is a few weeks to form better habits and get on a beneficial sleep schedule. Not only could this help boost your grades but early birds have also been proven to be happier, healthier people. We as humans were designed to be awake when the sun is out and asleep when it’s dark out. So let’s see how making the change to an early riser can be done. 


For starters, so long as you do not have a sleep disorder, it is important to try and stay on the same schedule whether it is during the week or the weekend. Sleeping in an extra couple hours (or five…) throws off your internal clock and the schedule you’ve been working on all week. Our bodies regulate our sleep-wake cycle by use of the hormones cortisol and melatonin that help wake you up in the morning and calm you down at night.
 
Following the psychiatrist’s advice, it is important to test and find out exactly how many hours of sleep you need a night. While many of us in college don’t have time to spend a week testing out when we naturally go to sleep and wake up without an alarm clock, Haward says you should try out getting a strict 7-8 hours of sleep a night by making yourself go to bed say around 11:30 and waking up at 7:30. Since most of us don’t get near to 7 hours of sleep a night, it is important to give this schedule time to make up for lost sleep before you start feeling the benefits. I personally don’t see this as very practical especially because procrastinating is one of the things I am best at and staying up until 2 AM to finish homework has never been a problem for me. However, I still find it key to not let myself sleep in and keep on the same schedule for waking up so that it does not throw my whole day off.

Others suggest to just gradually start waking up 15-30 minutes earlier than usual, adjust to this for the next few days, and then follow the pattern of cutting back another 15 minutes until you reach your goal wakeup time.
 
Always key in every article I have read, though, is to get to bed earlier. This is a no-brainer. Turn off electronics an hour before going to bed instead of staying up reloading your twitter timeline and checking Instagram until nothing new comes up for a solid 5 minutes… that’s when you know it’s late. If you really feel like you will not be tired going to bed earlier, read a book instead and you might find yourself asleep quicker than you expected.
 
Put your alarm clock far from your bed so that you have to get up to turn it off. DON’T HIT SNOOZE. Hitting snooze and falling back asleep for another few minutes only leaves you more drowsy when you actually get up. Turn on the lights and walk away from your bed so that you can’t even rationalize falling back asleep. 
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Reward yourself with something like the accomplished feeling after an early morning workout or a nice, big breakfast to start your day right. 

So there are some simple and not so easy steps to becoming a morning person. Even if you think you’re forever destined to be a night owl, you’d be surprised at what a decent sleep schedule and some healthy habits can do for you. Also, in the long run it looks like your grades will be better and you’ll be a happier, healthier person overall. 

http://www.fitnessmagazine.com/health/spirit/get-to-sleep-guide/become-a-morning-person/
http://www.wikihow.com/Become-an-Early-Riser
http://psychology.about.com/b/2013/10/03/becoming-a-morning-person-might-be-better-for-your-health-and-happiness.htm

Early Bird Gets the Better Grades

As I was sitting on the Blue Loop bus, I noticed a sign sitting above the row across from me saying that studies show, students who get up earlier on a regular basis get better grades. I don’t know about you, but this was a surprise to me so I decided to look further into it. I guess I just assumed that getting lots of sleep by not waking up until the late afternoon was far more beneficial than me listening to my 8 AM lectures while half asleep.

I found a couple studies that seemed to prove this true, and it actually does make sense. One study done at a Texas university compared the correlation between GPA and sleep habits. They used 824 undergrads that were taking psychology classes and gave them a questionnaire asking basic questions such as, “When do you go to sleep and when do you wake up?” along with “what time of day are you most productive?” They also asked students if they had no time constraints (such as classes they have to wake up for in the morning) what time would they get up? This was to show whether they are considered to be a morning person or evening person. The study also tried to eliminate some possible third-variable causes for correlation between GPA and sleeping habits by looking into other factors that could show a student’s GPA is estimated to be higher, such as the SATs and other standardized testing. Dr. Daniel J. Taylor, an assistant professor of psychology at the University of North Texas in Denton, says that they found these early risers had a GPA that was an average of an entire point higher than “night owls.” He says, “the more of a morning person you are, the more likely you are to have a higher GPA.” Early birds had an average GPA of 3.5 compared to late risers’ 2.5. I looked into two other not-so-detailed studies that appeared to find the same results. One study done by a biology professor named Christoph Randler at the University of Education in Heidelberg, Germany used 367 college students to reach a similar conclusion. Another study was done by psychology professors Serge Onyper and Pamela Thacher at the St. Lawrence University. All three studies claim to have discovered the same correlation.  
There are a few sensible reasons as to why these researches believe their findings to be true. Dr. Taylor from the University of North Texas study says that with early classes you are more likely to get to bed early and less likely to stay out late partying and drinking or “engage in other activities that can have negative influence on academic performance.” Christoph Randler from the University of Education in Heidelberg, Germany says that those who get up early have a better sense of what they need to get done in their day and also more time to do it. This enables them to accomplish things earlier on and typically be less stressed as the day comes to an end. Overall, he says early risers are more productive with their day which in turn makes them happier and healthier. The researches from St. Lawrence University explain similar points to Dr. Taylor in that although students who don’t have early classes typically get more sleep, they are also more likely to go out at night and consume more alcohol and other substances. Thacher states, “those who elect earlier classes may be more motivated to find ways to offset the early start time by making healthier choices about their daily living.”
I’m happy to know that my morning classes have in fact been beneficial in setting my internal clock to wake me up at 7 AM every morning, even if I don’t have class until the afternoon. I do notice that I can always find something to do with my time and feel far more productive waking up early than I do sleeping in late, feeling groggy for most of the day and realizing at noon how much I need to get done before the day is over. While these studies seem pretty accurate, I do believe there could be third variables causing the correlation between the time you wake up and grades. Maybe those who try harder in school are just naturally less lazy (so they prefer to sleep less) and like to be more productive with their day. Maybe those who do not enjoy going out and partying – things that generally take away from school work – got stuck with all the morning classes because they had later scheduling and were forced to take the classes available to them. Or maybe early risers have easier classes (which would make it easier to get a higher GPA) than those who get up later because they know how tired they would be in the morning and how difficult it is to concentrate. Because these are fairly large studies, third variables are less likely to be the cause but still, things to consider. Also, does this mean if I’m able to wake up at 5 in the morning every morning and last through the day, I have an even higher chance of succeeding in school when compared to someone who wakes up at 7 every morning? Maybe some of you have ideas of your own. 

early bird night owl.jpg

http://www.webmd.com/sleep-disorders/news/20080609/early-birds-get-better-grades
http://www.huffingtonpost.com/2011/09/08/earlier-classes-lead-to-b_n_954353.html
http://dailycollegian.com/2012/11/02/early-bird-is-the-word/

Music Makes You Smarter?

Music means a lot to most people whether you play an instrument, sing or just listen to it. While I am not musically talented, you will find me with earbuds in my ears as I walk around campus or music playing in my dorm room most of the time. While pop and rock music is only recently being discovered as beneficial while studying, classical music and the Mozart Effect were recognized years ago. 

When the study began in 1993 at a university in California, scientist Francis Rauscher made 36 students listen to either Mozart’s double piano sonata, a relaxation tape made to lower stress, or silence for 10 minutes. They then took an spatial temporal IQ test that showed subjects who listened to music for 10 minutes scored about 8 or 9 points higher than those who listened to the relaxation instructions or nothing at all. The belief is that Mozart’s music helps to improve spacial temporal reasoning. This was further researched by use of rats. They created four groups which either listened to Mozart, Philip Glass’ minimalist music  (which I can only handle listening to for less than a minute…), white noise or silence. They then had to navigate a maze and found that the group that listened to Mozart completed the maze faster and with less errors.   
Reasoning for this has to do with the part of the brain that is activated by classical music and how this region overlaps with the part of the brain used for spatial temporal tasks. Scientists say that listening to classical music would “prime the activation” of these regions of your brain. 
So while classical music has been proven to help with spatial temporal tasks, it has also been found helpful when studying math because it can aid in retaining more information and concentrating for longer. Pop is best for science and foreign language studying while rock and pop, which are typically more upbeat and emotion evoking, are helpful for english and the arts because it activates the creative, right side of your brain. 
While the effects of music are not guaranteed to be long-lasting, it’s worth a shot in using it to help you study. I know for me it helps to at least relieve some stress and make doing school work a bit more enjoyable. So long as it is not a distraction, might as well try it out!
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1281386/
http://www.bbc.com/future/story/20130807-can-music-make-you-smarter
http://www.cbsnews.com/video/watch/?id=50155076n

Stop Chewing on Ice

While I know it is a habit for many (including myself), it’s easy to finish a drink and just start biting on the ice left in your cup for fun. Chewing on ice seems harmless, however, this is unfortunately not the case. It can harm your teeth or even cause gum injury. By chewing on ice, you put pressure on your teeth which can cause your enamel to wear down. This makes it a lot easier for cracks and chips to occur and sensitivity often follows with the exposure of dentin in your teeth. If you have braces or just had dental work done, absolutely stay away from chewing ice. According to OralAnswers.com, it is also dangerous to create “a repetitive hot and cold cycle in your mouth, which can cause small cracks in the enamel.” It weakens your teeth and may even cause fillings to expand faster. 

There are various reasons as to why people like to chew ice. If you’re like me, it’s there and gives me something to do when my drink is finished. Plus, if I’m still thirsty it provides that extra tiny bit of liquid. On the other hand, some people have a serious addiction to chewing ice. This could be a sign of iron deficiency anemia or a medical problem known as pica. Iron deficiency affects about 2% of adult males and up to 16% of females ages 16 to 19 in the U.S. Pica is related to OCD, stress or nutritional deficiencies and refers to the desire to eat substances with no nutritional value. 
Nowadays, there is even so such thing as “chewable ice” which has become extremely popular, with brands such as Chewblet and Nugget Ice. While these ice makers are more desired during the summer, some franchises such as Sonic Drive-Ins even sell ice in cups and to-go bags year round. The addiction is a lot more serious than I thought for some people who go through cups upon cups a day of shaved or chewable ice.
Good alternatives to chewing ice are sugarless gum, carrot sticks, celery or apples. Just be very aware of the dangers and health issues the habit can cause. Anyone out there addicted to chewing on ice?
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Sources: 
Brat, Ilan. “Chew This Over: Munchable Ice Sells Like Hot Cakes.” The Wall Street Journal. N.p., 30 Jan. 2008. Web. 20 Sept. 2013.
“The Cold, Hard Truth: Chewing Ice and Teeth.” Go Ask Alice! N.p., 30 Mar. 2007. Web. 20 Sept. 2013.
“Why Is Chewing Ice Bad for Your Teeth?” Why Is Chewing Ice Bad for Your Teeth? N.p., 28 Jan. 2013. Web. 20 Sept. 2013.

Walk, Bike or Run?

All of us choose different ways of getting around Penn State’s huge campus. While our feet are the most common mode of transportation here, bikes and runners are absolutely everywhere too. So I really wanted to know, what’s the best form of exercise? While all provide great health benefits and a good way to get out there and get your heart pumping, in the end it comes down to what you truly enjoy, along with what you want to get out of your exercise.

When comparing running and walking through a study done in Berkley, California comparing 15,237 walkers and 32,215 runners over the course of up to six years, studies showed that runners had an easier time maintaining or losing wait in the long run (no pun intended). This was especially prevalent in the 55+ age group where although runners were not necessarily running quickly or expending much more energy than the walkers of this age group, they had noticeably slimmer waists and lower BMI. There is also evidence that running suppresses appetite, whereas walking does not have the same effect. However, both have excellent benefits such as help in the prevention of cataracts, high blood pressure, diabetes and heart disease. In the end, if you want to use the same amount of energy while walking as you do running, it takes about one a half times the distance to do so.
Walking and running are weight-bearing exercises, whereas biking is not because the bike itself is holding you up and doing some of the work for you. While biking puts less pressure on joints, weight-bearing exercises typically burn more calories. This does depend heavily, though, on the intensity of your biking workout. 
On running versus biking: To start, running burns more calories per minute than biking for the same reason that walking does. This changes, however, if you are biking at a very rigorous pace. Both biking and running have about an equivalent ability to suppress hunger. Injuries are clearly more common in running as it is harder on your joints and causes more muscle soreness.
The American College of Sports Medicine calculated that, “someone weighing 150 pounds who runs at a brisk seven minutes per mile will incinerate about 1,000 calories per hour. That same person pedaling at a steady 16 to 19 miles per hour will burn about 850 calories. Meanwhile, walking requires far fewer calories, only about 360 per hour at a 4-mile-per-hour pace.” 
In the end it is personal preference and whatever you enjoy and will stick with is the exercise for you.

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Sources:
Reynolds, Gretchen. “Ask Well: Is It Better to Bike or Run?” Well Ask Well Is It Better to Bike or Run Comments. N.p., 29 Aug. 2013. Web. 20 Sept. 2013.
Reynolds, Gretchen. “Is It Better to Walk or Run?” Well Is It Better to Walk or Run Comments. N.p., 29 May 2013. Web. 20 Sept. 2013.
Kucinski, Jessica. “Which Is Better Exercise: Walking or Biking?”LIVESTRONG.COM. N.p., 07 Feb. 2012. Web. 20 Sept. 2013.

Why Shoes are Bad for You

There is no doubt about it, shoes change the way we walk. Which is why everyone’s concern is arch support and cushioning and, of course, style (usually). Many people are even willing to jeopardize comfort for looks. As a runner and a sales associate at a sneaker store back home, I know the importance of a good quality shoe. It can make the difference for shin splints and tendonitis and feeling good knowing your shoes complete your outfit. But what if the shoes are the root of all these problems in the first place? 

Shoes are bad for our feet. Feet were never meant to be put in shoes. Whether tall stilettos, super cushioning, extremely supportive or great for people who over-pronate sneaks, shoes are not natural and they change the way we walk. According to Dr. William A. Rossi, it is impossible to walk with our natural gait when wearing shoes. 
He says, “It took 4 million years to develop our unique human foot and our consequent distinctive form of gait, a remarkable feat of bioengineering. Yet, in only a few thousand years, and with one carelessly designed instrument, our shoes, we have warped the pure anatomical form of human gait, obstructing its engineering efficiency, afflicting it with strains and stresses and denying it its natural grace of form and ease of movement head to foot.” 
A study was done at the University of the Witwatersrand in South Africa using 180 humans from Sotho, Zulu and Europe. These feet along with 2,000-year-old skeleton feet were all compared to determine whose feet were healthiest. The research showed that the Sulu people, who often do not wear shoes, had the healthiest feet, whereas the Eurpoeans (those who constantly wear shoes) had the worst. For centuries we have been creating shoes that try to make up for what we think our feet lack. But, as Galahad Clark, a man in the shoe business himself, now says, “It’s a back-to-basics philosophy: that the great Lord designed us perfectly to walk around without shoes” (Sternbergh). 
During cross-country season in high school, my favorite workout was one where we had to sprint 100 yards 50 times across a football field. For the second set of 25 we were allowed to take off our sneakers. I cannot tell you what a difference it made for that second half when I was already tired and worn out but my feet felt free and weightless. I ran even faster for the second half than I did for the first and my shin splints seemed to disappear. If we started walking around barefoot our feet would eventually callus and become use to hard surfaces but we have grown up with the “comfort” of shoes making it difficult for this transition. If you have any feet, ankle or knee problems I encourage you to walk around barefoot more often just to see how it feels.
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Sternbergh, Adam. “How We’re Wrecking Our Feet With Every Step We Take — New York Magazine.” How We’re Wrecking Our Feet With Every Step We Take — New York Magazine. N.p., 21 Apr. 2008. Web. 19 Sept. 2013.

Is Sunscreen Bad for You?

Although summer is long gone, the sun and its powerful rays are still around and we can at least have something to think about for next summer while lounging on the beach. Even though sunscreen has not been around long enough for us to fully know and understand its longterm effects, there is an ongoing debate as to whether sunscreen is actually good or bad for you. While I would not recommend one of my pale best friend’s theories that “you shouldn’t wear sunscreen ever because the chemicals are bad for you and in a few years scientists will realize it’s killing us instead of helping” as she gets FRIED every time she lays out, I did decide to do some research to try and get to the bottom of this.

According to Arthur Perry, MD, FACS from the Dr. Oz show, sunscreen is in fact harmful to us due to the chemicals in a majority of brands. 15 of the 17 FDA approved chemicals in sunscreen that are used to block out harmful UV rays do not sit on top of the skin but instead seep into the bloodstream when you rub them in. These 15 chemicals are known as “endocrine disruptors” and can cause a variety of issues from infertility to early puberty and abnormal development of fetuses (Perry). Zinc oxide (that white or blue stuff you see on lifeguard’s noses sometimes) and titanium dioxide are the two chemicals in sunscreen that are not absorbed into your skin and do not have these harmful affects. Dr. Perry recommends using these two chemicals alone to defend against the sun instead of constantly reapplying toxins. 
On the other side of the argument in an article I read here, the American Academy of Dermatology says otherwise. They say that sunscreen is in fact beneficial and essential in fighting those UV rays. In the article they discuss sunscreen do’s and don’ts including trust that your sunscreen works, apply often and make sure you have good coverage, and don’t believe the nonsense about harmful chemicals. While studies have shown that using a sunscreen with SPF below 15 is virtually ineffective, so long as you use a sunscreen higher than that it sounds like you should be good. It is recommended to reapply every two hours and use about a shot-glassful of sunscreen to cover your entire body. When it comes to the “harmful,” “hormone-disrupting” chemicals in sunscreen, some say the claims cannot be trusted or proved valid because the studies have been conducted on mice. They say “the animals were fed significantly greater amounts of the chemical than what’s commonly applied in sunscreen” (Kotz). I guess these chemicals could have similar effects just not as drastic as on the mice because it is a smaller amount that we put on our skin.
So, who do you believe? Are you a sun-loving person who lathers up to protect their skin? Or do you choose to forgo it and put up with the burn (or natural tan) without the use of sunscreen?
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Kotz, Deborah. “Is Sunscreen Dangerous? 4 Sun Protection Do’s and Don’ts.” US News. U.S.News & World Report, 25 May 2010. Web. 17 Sept. 2013.
Perry, MD, FACS, Arthur. “Your Sunscreen Might Be Poisoning You.” The Dr. Oz Show. N.p., 07 May 2013. Web. 16 Sept. 2013