Food sensitivities are considered a type III reaction, in that it involves various classes of food-specific immunoglobulin molecules that can form food immune complexes, and is unique to the physiology of the person. Reactions to food can be anywhere from an hour up to a week later.
Some people who have gone through the expense and time of an IgE test resulting in negative findings for food reactions and are still dealing with major life disrupting symptoms that physicians do not have an answer for. You may not have an allergy; it may be a sensitivity or intolerance.
Sensitivities are distinguished from immediate allergies because they are delayed symptoms appearing several hours to days after exposure. Physical manifestations are a result of T lymphocytes and delayed IgG antibodies triggered typically by food; food related chemicals such as additives, fillers preservatives, drugs, synthetics, colouring, and food itself.
With that said, with our increasing use of environmental toxins, chemicals and pollutants, IgG symptoms may be triggered from these as well. Chemicals such as sprays, resins, pesticides, herbicides, house hold cleaning products, laundry products, personal hygiene products, carpeting, flooring, painting and finishing products and so on.
Symptoms of IgG have some overlapping qualities with IgE allergy symptoms which is why if you have a conventional skin prick test done, the results are negative and you are still suffering, you need to investigate further with an IgG test.
With food sensitivities, there is usually an inflammatory response involved. This is why if you are suffering with an inflammatory response type of condition such as cardiovascular disease, diabetes, Chron’s Disease and other Inflammatory Bowel Disease, arthritis, cancer and gout ( to name a few) it is important to understand that by removing inflammatory reactors will help decrease inflammation and allow your immune system to grow strong and fight off illness and disease.
There are four subclasses of IgG, 1, 2, 3, 4, of which IgG1 and IgG4 appear to be the most dominating subclasses to food antigens1. IgG1 antibodies responds to new food antigen, IgG2 and IgG3 react to cell surface oligosaccharides of viruses and protozoa. Once IgG1 binds to the antigen, the antibody-antigen complex is quickly destroyed by the kupffere cells in the liver and other macrophages (think pack-man eating dots and the dots). The IgG1-antigen complex can stimulate the complement cascade and attendant inflammation. The ongoing attack by not removing offending foods depletes the immune system and continues the symptoms of illness and dis-ease experienced by an inflammatory response2.
Another great resource for understanding how food sensitivities can affect you and your children; Author Dorris Rapp Is this your Child is the leader in food and environmental sensitivities in the United States (and probably the world).
Watch video here http://youtu.be/fRDpcWZUEiU
She has thousands of case studies, most of them documented by film (which you can purchase on her website or visit her youtube channel ) show casing children suffering with behavioral problems and classic kid allergies symptoms from uncommon substances to common substances. The most profound is the reactions to some foods and similar behaviors to what doctors call Attention Deficit Disorder (ADD) and Attention Deficit Hyperactive Disorder (ADHD). By removing the offenders specific to that child, symptoms and behaviors clear up and most that are overweight also lose inflammatory weight. This is the same for adults.
You have the ability to lose weight, and eliminate unwanted behaviours and thought processes by understanding what your allergies and sensitivities are.
The point is food sensitivities whether you are an adult or a child, affect us all differently. And just because an allergist says “you don’t have an allergy,” Does not mean that you may not have a sensitivity or intolerance. Don’t give up.
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Check out these great articles
What is an Allergy
Irritable Bowel Syndrome and Food Sensitivities
Spring Into Action on those Bloom’n Seasonal Allergies
More Children Have Allergies CDC Reports
Foods that make you feel bloated and fat Download your Food Journal