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Thursday, September 11, 2008

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Know Your Food Allergies

A food allergy is a potentially fatal response by a person’s immune system to a food or food component. After a susceptible person ingests a problem food, the immune system reacts with the release of histamines and other chemicals that trigger symptoms ranging from mild to severe.

Individuals who suffer allergic reactions to a particular food need to be especially cautious because a food allergy can trigger anaphylactic shock. This potentially life-threatening condition is characterized by difficulty breathing and a dangerous drop in blood pressure.

Milder symptoms such as itching, hives and swelling may also be experienced. However, there is no way to know whether a person with a food allergy is likely to have a mild or severe reaction after eating the problem food. Symptoms that begin as mild to moderate can quickly intensify, becoming much more severe. Therefore, the only effective treatment option for a food allergy is avoidance.

Avoidance involves the complete removal of harmful foods from the diet. It requires careful and constant consideration of packaged food ingredients as well as the cooking procedures and ingredients used at restaurants. The knowledge of alternate names related to a problem food is also essential.

Many individuals confuse food allergy with food intolerance, which is much more common and not as severe. Food intolerance involves the inability of the body to digest a food or food component, leading to symptoms of discomfort (e.g., stomach cramping) but that pose little danger. Food intolerance often allows the individual to eat small portions of a problem food without experiencing symptoms. With a food allergy, even a very small portion of a food allergen can cause an allergic reaction.

True food allergies occur in roughly 1 to 2 percent of adults and 3 to 8 percent of children, according to the Asthma and Allergy Foundation of America. About 90 percent of all food allergies have been traced to the following foods:

1) Cow’s milk
2) Eggs
3) Peanuts
4) Tree nuts (e.g., almonds, walnuts)
5) Wheat
6) Soybeans
7) Fish
8) Shellfish

A physician can help to determine which food is causing a patient’s allergic reaction by using tests such as the skin test or the double blind oral food challenge. After successfully identifying the culprit food, a person must remove the food entirely from their diet.

Tuesday, August 05, 2008

Children Can Develop Tolerance to Egg Allergy

Gradually exposing children with egg allergies to cooked egg could help them overcome the allergy, a new study reports.

In the Greek study, tiny amounts of cake containing heat-treated egg were feed to 94 children every day with the amount of cake gradually increased over six months. Eighty-seven children (90 percent) were able to eat the cake without allergy symptoms.

After six months, the children who did not display allergic reactions attempted to eat an egg not cooked to the same degree as the one in the cake. More than 95 percent experienced no reaction and were thought to have overcome the allergy.

The findings were expected to be published an upcoming issue of the Journal of Allergy and Clinical Immunology.

One in 17 children younger than age 3 has a food allergy, one of the most common being to hen eggs, according to the American Academy of Allergy, Asthma & Immunology (AAAAI). Many children outgrow the egg allergy by school age, but until then, the only effective management is eliminating all egg from their diet.

Thursday, July 17, 2008

There is no cure for asthma

People with asthma experience intensified symptoms during an asthma attack, which occurs when exposure to allergens or other stimuli further inflame the airways, leading to an inability to expel trapped air from the lungs.

There is no cure for asthma. People with asthma have a chronic and variable, but controllable, condition. Patients can combine education, lung function measurement, avoidance techniques, lifestyle changes and appropriate medications to reduce the likelihood of experiencing symptoms. Such a comprehensive approach is known as asthma management.

The key goals in an asthma management plan include achieving the following:
• Minimal or nonexistent chronic symptoms
• Minimal or nonexistent flare-ups
• No restrictions on physical activity
• No missed work or school days due to asthma
• No emergency room visits or hospital room stays
• Minimal need to use short-acting inhaled beta-agonists
• Minimal or nonexistent side effects due to medications

Once an individual has been diagnosed with asthma, a physician will develop a specific asthma action plan to help the patient monitor the condition.

Thursday, July 03, 2008

Asthma Attacks

Asthma attacks occur when an allergen (a substance the body perceives as a threat, triggering an allergic reaction) or irritant triggers an exaggerated response in a person with asthma (chronically sensitized or inflamed airways). Shortness of breath, chest tightness, coughing and wheezing (a whistling or high-pitched sound that results when breathing tubes are narrowed or obstructed) are among the symptoms that appear as the airways constrict and air becomes trapped in the lungs.

An asthma attack targets the body’s bronchial tubes, which bring oxygen to the lungs when a person inhales and remove carbon dioxide from the body when a person exhales. The diameter of these tubes narrows dramatically during an asthma attack due to a combination of factors, including:

1) Inflammation and swelling of the lining of the tube
2) Mucus buildup in the tube
3) Smooth-muscle tightening around the tube

As a result, the person is less able to move air into and out of the lungs. A person experiencing an asthma attack must immediately take prescribed medication such as an inhaled bronchodilator or an injection of epinephrine contained in an allergy kit. The longer an attack continues, the greater the risk of severe health consequences. People experiencing an asthma attack who do not have medication or have symptoms that are not relieved with medication should seek immediate emergency medical care. In rare cases, asthma attacks can be fatal.

Saturday, June 07, 2008

Childhood Asthma, Allergies Traced to Womb

At least some of the biological risk for childhood asthma and allergies traces back to the womb, new research suggests.

Both the order of birth and even the way a baby is delivered have a significant impact on the long-term strength of a child's allergic defenses, scientists say.

The findings were recently presented during the American Thoracic Society's International Conference, in Toronto.

At the meeting, one team of scientists said it had evidence indicating that when a specific genetic marker for allergic and asthmatic development is present among a first-born child, it appears to raise the risk for allergic conditions as far as 10 years down the road. However, when the exact same marker is present in a family's second or third child, the gene seems to have exactly the opposite effect -- actually lowering such risk.

"This is the first time it has been demonstrated that birth order can affect the behavior of genes related to asthma and allergies, and that birth order can therefore affect the risk for developing one or the other," said study author Dr. Wilfried Karmaus, a professor in the department of epidemiology and biostatistics at the University of South Carolina in Columbia.