Fatigue can be a sign of food allergy, including milk protein allergy. It may be related to other chronic symptoms of the allergy, such as coughing, running or stuffy nose and digestive problems, that interfere with your sleep. Consult your doctor for help in identifying the cause of your tiredness.

Quinine, a bitter tasting powder made from the bark of the cinchona tree, is known mainly for its use in malaria treatment.

Consuming gluten is typically safe for most people, unless you are intolerant or allergic to the protein. Gluten intolerance, also known as celiac disease, is an autoimmune disease where the body attacks the lining of the small intestines, causing permanent damage.

One of the most common food allergies among children is a milk allergy, according to MayoClinic.com. Although the allergic reaction is typically related to cow’s milk, you may be allergic to other types of milk, such as that from goat and sheep.

Salicylates are a natural chemical produced by plants, believed to be used as a pest repellent, according to the Auckland Allergy Clinic. Salicylates are naturally related to the chemical compound, salicylcic acid, found in aspirin.

Beef allergies affect an estimated 3 percent to 6.5 percent of children, including one of every five children allergic to cow milk, according to a 2001 report from the Internet Symposium on Food Allergen's Matthew Belser and colleagues. Most children outgrow their allergies within three years.

Your scalp is part of the body's biggest organ: the skin. Some people with food allergies, including dairy allergy, report an itchy scalp and other skin irritations, ranging from rashes to eczema. Eczema is a chronic disorder that features long-term inflammation of the skin.

Colitis is an inflammatory bowel disease. There are several types of colitis, depending on the location of the inflammation. Symptoms vary but commonly include abdominal cramps, bloating, constipation and diarrhea. There's really no nutritional therapy for colitis, nor is there a cure.

Food with gluten will not irritate gastritis unless you have an underlying condition that causes an adverse reaction to gluten. If you notice that whenever you eat foods that contain wheat you develop gastric symptoms, you need to see your doctor for a clinical diagnosis.

Food allergies are common with certain foods, such as peanuts, milk and eggs, but virtually any food has the potential to cause an allergic reaction.

Food allergies occur when your body views a substance as a foreign intruder that must be eliminated, causing your body to respond much in the same way it does to a virus or bacteria. Chemicals called histamines are released that cause everything from itchy skin to coughing and stomach pain.

Gluten is a protein found in many different grains, including wheat, rye, oats and barley. Individuals who develop an allergy to gluten -- a condition called celiac disease -- are unable to consume foods containing this protein without enduring gastrointestinal pain, including diarrhea in some cases.