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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.

Exercise is anything that gets your body moving. 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 (long-term) diseases.

Every physical fitness routine is built on a few simple ideas. These include:

• Make exercise a habit, as your body adapts to the type of activity you do most often. Regular practice will help you improve.
• Build up your activity level slowly to help you continue to get stronger, faster, or more flexible without pushing too hard all at once.
• Challenge yourself by lifting slightly heavier weights, adding a few more minutes to your walk, or increasing your pace.
• Mix up your workouts to keep things interesting and help prevent injuries or burnout.
• Show up regularly, even for short sessions, to help you continue to make progress.

There are many different types of exercise. Before you start, check with your health care provider, especially if you have trouble moving, balancing, or worry that exercise might not be safe for you.

A few main types of exercise include:

• Aerobic exercises such as walking, running, or swimming are sometimes referred to as cardio. This is short for cardiovascular exercise. These exercises increase your breathing and heart rate. They keep your heart, lungs, and circulatory system healthy and improve your overall fitness.
• Strength, or resistance training, exercises use weights, resistance bands, or your own body weight to build stronger muscles.
• Balance exercises, such as tai chi or standing on one leg, improve your stability and coordination. They may make it easier for you to walk on uneven surfaces and help prevent falls.
• Flexibility exercises, such as stretching or yoga, help your joints move more easily and improve your posture.

Most people benefit from a combination of these types of exercises. Your provider can help you choose the best type or amount of activity for you based on your fitness level and health.

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 small amounts of exercise can be helpful. You can work your way up to doing the recommended amount of exercise.How much exercise you needdepends on your age and health.

To get started, you don't need fancy equipment, but having the right tools can make it easier and more fun. There are a variety of places where you can exercise and create a routine that fits your lifestyle. This includes:

• At home. Dumbbells, kettlebells, a mat, or resistance bands are versatile and affordable options for strength training and stretching. A treadmill, a stationary bike, or a workout video are a few options for indoor cardio.
• A fitness center, gym, or health club. These places offer equipment, classes, and sometimes personal trainers for guidance and support. Ask if you can try the center before you join, and if staff are available to show you how to use the exercise equipment.
• Outdoors. Try riding a bike, walking your dog, or exploring local parks and trails. Dress for the weather and protect yourself from the sun. If safety is a concern, choose a well-lit neighborhood, a busy park, or even an indoor shopping mall for your walk.

Include activities that strengthen all parts of your body, especially your core, which are the muscles in your abdomen (belly), back, and hips. A strong core helps with balanceand stability and can lower your risk ofback injuries.

If youhaven't exercised in a while, start slowly and talk to your provider if you have health concerns. If you don't feel right, or have any pain, extremeshortness of breath, ordizziness, stop exercising and seek help right away.

Even with the best intentions, it's easy to fall off track. Here are some ways to keep going:

• Choose activities you enjoy. It's easier to make exercise a regular part of your life if you have fun doing it.
• Exercise safely. Use the proper equipment to preventinjuries, listen to your body, and don't overdo it.
• Give yourself goals. Your goals should be challenging, but realistic. It may be helpful to reward yourself when you reach them. The rewards could be something big, like new workout gear, or something smaller, such as a new water bottle or movie tickets.
• Mix it up. Try a new class, playlist, Podcast, or outdoor route when things get stale.
• Find an accountability partner. Exercise with a friend, join a group challenge, or check in with an online community.
• Use wearable technology. A pedometer or an app like a fitness tracker on your phone or other device can help you track your progress.

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