The Rights and Wrongs of Sunscreen Use

The topic of sunscreen use is rife with  strongly recommends sun avoidance practices including use of sunscreens year round to reduce the risk of developing skin cancer. Here are a few of the common misconceptions regarding the use of sunscreens preventing skin damage from sunburn:

controversy and misconceptions. Some authorities advocate against their use, believing that too little sun exposure will reduce the body's vitamin D levels with the increased risk of osteoporosis and certain cancers (breast, colon, and prostate). The American Academy of Dermatology, on the other hand,

Misconception #1 - The SPF is an indication of sunscreen protection across the entire ultraviolet light spectrum. The sun emits two types of ultraviolet light---UVB, which causes sunburn and can lead to skin cancer, and UVA, which causes wrinkles and deeper skin damage that can also lead to skin cancer. Most people know that SPF stands for sun protection factor. What is less well known is that this is a measure of how well the sunscreen deflects UVB rays only. Sunscreens that pass the Federal Drug Administration's (FDA) broad spectrum test, however, will have demonstrated that they also provide UVA protection that is proportional to their UVB protection.

Misconception #2 - The higher the SPF, the better. SPF values displayed on sunscreen labels range from 2 to as high as 50 (or higher). This refers to the product's ability to screen or block out the sun's harmful rays. Theoretically, a sunscreen with SPF 15 will allow you to be in the sun 15 times longer than you could without sunscreen before becoming sunburned. Protection from sunburn, however, does not increase proportionally with an increased SPF number. A SPF of 2 will absorb 50% of ultraviolet radiation, an SPF of 15 absorbs 93% and an SPF of 34 absorbs 97%. No sunscreen can block 100% of the sun's rays.

Misconception #3 - Waterproof sunscreens stay on even when swimming. There is no such thing as "waterproof" sunscreen. The FDA even prohibits manufacturers from labeling sunscreens as "waterproof" because these claims overstate their effectiveness. Sunscreens can be labeled as being "water resistant" if they maintain their SPF rating after 40 to 80 minutes of water exposure. Most sunscreens will not maintain their SPF rating after swimming or sweating heavily for much more than an hour.

Misconception #4 - Sunscreens are so concentrated that a thin coating is all that's necessary. Most people do not use adequate amounts of sunscreen. Studies have shown that people apply only about 25-50% of the amount required to reach the labeled SPF rating.

Misconception #5 - Vitamin A added to sunscreen is important for skin health. It's true that Vitamin A added to sunscreen will help hydrate skin and prevent skin degradation. Data from an FDA cancer study, however, showed that Vitamin A in a synthetic form called retinyl palmitate may also speed the growth of skin tumors.

Recommendations for effective sunscreen use. The ideal sunscreen would completely block all UV rays, remain effective on the skin for several hours, and not cause skin irritation. Unfortunately, the ideal sunscreen does not yet exist. Here are some tips for the more effective use of the sunscreens that are currently available.

• For most people, a sunscreen with a sun protection factor (SPF) of 15-30 will provide adequate protection.
  
• Look for sunscreen that says that it provides "broad spectrum" protection. Broad spectrum protection means that it has both UVA as well as UVB blocking properties.
  
• Perhaps more important than the SPF rating is appropriate application and reapplication of sunscreen. Be sure to apply sunscreen at least 15-30 minutes before exposure to the sun. Follow the guideline from the American Academy of Dermatology--- "one ounce, enough to fill a shot glass", is the amount needed to cover exposed areas of the body. This amount should be adjusted depending on body size and the amount of exposed skin. "Water resistant" sunscreens need to be reapplied every 1 to 2 hours when swimming or sweating heavily.
  
• If you are extremely UV-sensitive, get a sunscreen with an even higher SPF rating. For all intents and purposes, a sunscreen rated 50+ is as high as anyone needs.
  
• For maximum protection against UV rays, use a sunblock rather than sunscreen. These contain physical agents, such as titanium dioxide or zinc oxide keep UV rays from reaching the skin.
  
• One of the best ways to protect your skin from cancer and premature aging is by limiting sun exposure and wearing protective clothing. Avoid sun exposure between 10 AM and 4 PM, the time that UV radiation is at its highest. Remember also that UVA radiation is not significantly lower during morning hours or on overcast days.

If you have any questions about the rights and wrongs of sunscreen use, please log into your account and send us your question. We are here to help.

Iron Deficiency Anemia

Iron is an important building block for red blood cells. When the body lacks adequate amounts of iron, red blood cells become smaller and are produced in inadequate numbers. This results in decreased hemoglobin levels, the protein that transports oxygen in red blood cells. This condition is known as iron deficiency anemia and is the most common reason for having a "low blood count".

What causes iron deficiency anemia? Most people are aware that iron deficiency anemia can occur because of not getting enough iron in the diet. Vegetarians have to be particularly careful to include iron-fortified foods or vegetable sources of iron (beans, tofu, dark green leafy vegetables, etc.), since foods with the highest iron content are primarily animal based (meat, poultry, fish).

While inadequate intake is a common cause, there are a number of other reasons for the development of iron deficiency anemia. Women with heavy periods or gynecological conditions associated with excessive bleeding may develop iron deficiency anemia because the iron in red blood cells, which is usually recycled, is lost from the body. Likewise slow and sometimes unnoticed blood loss (such as that from a stomach ulcer, colon polyp, or colon cancer) can result in iron deficiency anemia.

Two increasingly common causes of iron deficiency anemia develop because of the inability to absorb iron from the intestine. Celiac disease, an autoimmune disease that damages the small intestine interferes with absorption of iron from food. Likewise, people who have undergone gastric bypass may also lose the ability to absorb iron due to decreased gastric acid secretion and from bypassing the first portion of the small intestine (duodenum).

Pregnant women are at risk of developing iron deficiency anemia because of an increased blood volume during pregnancy, as well as the demands of the growing fetus for iron. Infants who drink cow's milk in the first year of life are at risk for iron deficiency anemia because cow's milk does not have enough of the iron infants need to grow and develop.

What are the symptoms of iron deficiency anemia? Initially in the course of iron deficiency anemia, people may have no symptoms at all. As the anemia worsens and significant reduction in oxygen carrying capacity of the red blood cells develops, symptoms may include pale skin, fatigue, lightheadedness, glossitis (tongue inflammation), and cold intolerance. In severe cases, iron deficiency anemia may lead to a rapid or irregular heartbeat, shortness of breath, and fainting. Pregnant women with iron deficiency anemia may experience premature delivery with low birth weight babies. In infants and children, severe iron deficiency can lead to delayed growth and development. Some of the signs and symptoms of iron-deficiency anemia are related to the condition's underlying cause. For example, a sign of intestinal bleeding is bright red blood in the stools or black, tarry-looking stools.

How is iron deficiency anemia diagnosed? The typical blood tests used to diagnose iron deficiency anemia are:

• Hematocrit, a test that measures the percentage of the blood volume that is made up of red blood cells. Normal results vary, but in general, a male has between 40 and 50% of their blood volume as red blood cells and women between 36 and 44%. Levels below this indicate that someone is anemic, although it does not specify the cause.
  
• Hemoglobin is a protein in red blood cells that carries oxygen. A reduced hemoglobin level occurs in most types of anemia.
  
• Red blood cell indices are part of a complete blood count (CBC), along with hemoglobin and hematocrit. This test looks at the size and the hemoglobin content of red blood cells. In iron deficiency anemia, red blood cells are smaller and paler in color than normal.
  
• Serum Iron/Ferritin measure the amount of iron in the blood and the amount of a stored form of iron in the body, respectively.

How is iron deficiency anemia treated? The treatment of iron deficiency anemia hinges on the underlying cause. When blood loss is responsible, the source for the bleeding should be addressed. This could necessitate medical treatment for a bleeding ulcer or surgery in the case of bleeding fibroid tumor or colon cancer. Avoidance of sources of gluten (when, rye, barley) with subsequence easing of the inflammation in the small intestine will allow someone with celiac disease to absorb iron normally.

Even if the cause of the iron deficiency is identified and treated, it is usually necessary to increase dietary sources of iron and to take iron supplements until iron stores are restored. The best iron sources include meat, poultry, fish, legumes (lima beans, peas, pinto beans, etc.), dried fruits such as apricots, prunes and raisins, iron-enriched pastas, grains, rice, and cereals, and green vegetables (spinach, broccoli, kale, etc.). Medicinal iron used in treating patients with iron deficiency is higher than the amount found in most daily multivitamin supplements. Most people with iron deficiency will need 150-200 mg per day of elemental iron per day. There are many forms of iron supplements which contain different amounts of elemental iron: 1 gram of ferrous gluconate = 120 mg elemental iron (12% iron); 1 gram of ferrous sulfate = 200 mg elemental iron (20% iron); 1 gram of ferrous fumarate = 330 mg elemental iron (33% iron). The effectiveness and side effects are similar for these different forms when used in equal doses of elemental iron. Vitamin C (ascorbic acid) improves iron absorption, and some doctors recommend that you take 250 mg of vitamin C with iron tablets. Possible side effects of iron tablets include abdominal discomfort, nausea, vomiting, diarrhea, constipation, and dark stools. In the case of a severe iron deficiency anemia, particularly when the inability to absorb oral iron is responsible, administration of iron through the vein may be necessary.

Lyme Disease Awareness Month

In recognition of Lyme Disease Awareness month this May, the Centers for Disease Control and Prevention (CDC) encourages Americans to learn about this common tick-borne disease and take steps to protect themselves if they live in or visit areas with Lyme disease activity. Statistics from the CDC indicate that there has been a progressive rise in the number of cases of Lyme disease diagnosed. In fact, it is now the most commonly reported vector-borne illness (disease transmitted to humans by ticks, mo
squitoes or fleas) in the United States, with around 30,000 new cases each year. In 2010, 94% of Lyme disease cases were reported from 12 states, mostly in the northeastern U.S., near the town where the disease gets its name—Lyme Connecticut.

What causes Lyme disease? Lyme disease is an infection caused by a type of bacteria known as Borrelia burdorferi. The infection is most often acquired from the bite of an infected deer tick, also known as a black-legged tick. Ticks that spread the infection are in the nymph stage of their life cycle and are quite small when compared to the adult ticks. The infection is spread when a young tick feeds on an infected animal, taking Borrelia bacteria into its body. If the tick then feeds on a human, the bacteria can be passed along to its new host. There is no evidence that Lyme disease can be passed on from person-to-person.

What is the first sign that someone may have Lyme disease? Lyme disease produces different manifestations at different times during the course of the illness. The first sign of an infection is usually a rash called erythema migrans (EM). This is a circular rash that develops at the site of the tick bite. This rash occurs in approximately 70-80% of those infected, appearing anywhere from a few days to a month after the tick bite. EM gradually expands over a period of several days and can reach up to 12 inches in diameter. Sometimes the center of the rash clears, resulting in a "bull's eye" appearance.

What symptoms are associated with Lyme disease? Along with the rash, most people with early Lyme disease develop symptoms such as fatigue, chills, fever, headache, muscle and joint aches. If treatment is not begun, other symptoms develop within days to weeks. These include facial paralysis, headaches, neck stiffness, heart palpitations and "migratory" joint pain which moves from joint to joint. Late manifestations of the disease includes arthritis, particularly affecting large joints, such as the knees, and neurological complaints including mental status changes, altered sensation, malaise, headache, and sleep disturbance.

Is there a test available to diagnose Lyme disease? The tests used in diagnosing Lyme disease are most accurate a few weeks after an infection develops. This is when the body has begun producing antibodies to fight the infection. The CDC currently recommends a two-step process when testing blood for evidence of antibodies against the Lyme disease bacteria. The first step involves procedure called "EIA" (enzyme immunoassay). If the first step is negative, no further testing of the specimen is recommended. If the first step is positive, a second step called an immunoblot test, or "Western blot", is performed. The laboratory diagnosis of Lyme disease is confirmed only when both the EIA and immunoblot are positive.

How is Lyme disease treated? Most cases of Lyme disease can be cured with antibiotics, especially if treatment is begun early in the course of illness. Antibiotics that are effective for Lyme disease include doxycycline, amoxicillin, and cefuroxime axetil (Ceftin).

Can Lyme disease be prevented? To prevent Lyme disease and other tick-borne diseases, the CDC recommends that people:

• Avoid areas with high grass and leaf litter and walk in the center of trails when hiking.
  
• Use repellent that contains 20 percent or more DEET on exposed skin for protection that lasts several hours. Parents should apply repellent to children; the American Academy of Pediatrics recommends products with up to 30 percent DEET for kids. Always follow product instructions!
  
• Use products that contain permethrin to treat clothing and gear, such as boots, pants, socks and tents or look for clothing pre-treated with permethrin.
  
• Bathe or shower as soon as possible after coming indoors to wash off and more easily find crawling ticks before they bite you.
  
• Conduct a full-body tick check using a hand-held or full-length mirror to view all parts of your body upon returning from tick-infested areas. Parents should help children check thoroughly for ticks. Remove any ticks right away.