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A food allergy is an abnormal immune system reaction to certain foods. Your immune system normally protects you from germs. But if you have a food allergy, your immune system mistakenly reacts to certain foods as if they were harmful. This reaction is usually mild. But in some cases, it can be serious or even life-threatening.

A food intolerance is different than a food allergy. If you have a food intolerance, you also have symptoms when you eat that food. But these are typically just digestive symptoms such as bloating and gas. Also, an intolerance is not an immune system reaction.

Most food allergies are caused by:

• Cow's milk
• Chicken eggs
• Crustacean shellfish, such as shrimp, crab, lobster, and crayfish
• Fish
• Peanuts
• Sesame
• Soy
• Tree nuts, such as almonds, walnuts, pecans
• Wheat

People with a food allergy may be allergic to more than one type of food.

Both children and adults can have food allergies. Some children will outgrow their food allergies. And sometimes people can develop food allergies as adult.

Certain factors can make you more likely to have a food allergy. They include:

• Having eczema, a disease that causes inflammation, redness, and irritation of the skin. Your immune system also plays a role in eczema.
• Having asthma or other allergies, such as hay fever.
• Your genes. Certain genes may influence the development of food allergies. And you are more likely to have food allergies if someone in your family has allergies, asthma, or eczema.

If you are allergic to a food you have eaten, you may have a variety of symptoms. These symptoms are not always the same for every person. And the symptoms that you get each time you eat the food may not always be the same. For example, your symptoms may sometimes depend on how much of the food you ate.

Food allergy symptoms usually start within a few minutes to two hours after you eat that food. They may include:

• Hives
• Flushed skin or rash
• Tingling or itchy sensation in the mouth
• Face, tongue, or lip swelling
• Vomiting and/or diarrhea
• Abdominal (belly) cramps
• Coughing or wheezing
• Dizziness and/or lightheadedness
• Swelling of the throat and vocal cords
• Trouble breathing

In rare cases, a food allergy can cause a life-threatening reaction called anaphylaxis. It may start out with some milder symptoms, but then it becomes more serious. It can lead to:

• Narrowed airways in the lungs
• Severe trouble breathing because of swelling in the throat
• Severe lowering of blood pressure and shock ("anaphylactic shock")
• Loss of consciousness

This is a medical emergency. Call 911 if someone is having the symptoms of anaphylaxis.

To find out if you have a food allergy, your health care provider will

• Ask about your symptoms, family health history, and medical history, including other allergies.
• Likely do a physical exam.
• Do food allergy testing. This could involve skin testing, blood testing, a food elimination diet, and/or an oral food challenge test. An oral food challenge test is the most accurate food allergy test.

There is no cure for food allergies. The only way to prevent a reaction is to avoid eating the food that you are allergic to.

There are medicines for people with food allergies. They include:

• Medicines to reduce food allergy symptoms, including antihistamines and corticosteroids.
• Medicines to reduce allergic reactions, including severe reactions.
• Epinephrine, a medicine to treat anaphylaxis. Your provider may give you a prescription for an epinephrine auto-injector. It is a device used to inject epinephrine when someone is having symptoms of anaphylaxis. If you have been prescribed one, it's important to learn how to use it and to carry it with you at all times.

If you have a food allergy, it's a good idea to have a medical alert bracelet that says what your allergy is.

Regular exercise is one of the best things you can do for your health. It has many benefits, including improving your overall health and fitness, and reducing your risk for many chronic diseases. There are many different types of exercise; it is important that you pick the right types for you. Most people benefit from a combination of them:

• Endurance, or aerobic, activities increase your breathing and heart rate. They keep your heart, lungs, and circulatory system healthy and improve your overall fitness. Examples include brisk walking, jogging, swimming, and biking.
• Strength, or resistance training, exercises make your muscles stronger. Some examples are lifting weights and using a resistance band.
• Balance exercises can make it easier to walk on uneven surfaces and help prevent falls. To improve your balance, try tai chi or exercises like standing on one leg.
• Flexibility exercises stretch your muscles and can help your body stay limber. Yoga and doing various stretches can make you more flexible.

Fitting regular exercise into your daily schedule may seem difficult at first. But you can start slowly, and break your exercise time into chunks. Even doing ten minutes at a time is fine. You can work your way up to doing the recommended amount of exercise. How much exercise you need depends on your age and health.

Other things that you can do to make the most of your workouts include:

• Choosing activities that work all the different parts of the body, including your core (muscles around your back, abdomen, and pelvis). Good core strength improves balance and stability and helps to prevent lower back injury.
• Choosing activities that you enjoy. It's easier to make exercise a regular part of your life if you have fun doing it.
• Exercising safely, with proper equipment, to prevent injuries. Also, listen to your body and don't overdo it.
• Giving yourself goals. The goals should challenge you, but also be realistic. It's also helpful to reward yourself when you reach your goals. The rewards could be something big, like new workout gear, or something smaller, such as movie tickets.

Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus. Travelers outside the United States may be at risk for malaria and other infections.

To prevent insect bites and their complications:

• Don't bother insects
• Use insect repellant
• Wear protective clothing
• Be careful when you eat outside because food attracts insects
• If you know you have severe allergic reactions to insect bites and stings (such as anaphylaxis), carry an emergency epinephrine kit