There are several different types of reactions that can take place when you consume food and they are generally known as immune responses.
The immune system is engaged as soon as we start chewing our food. In our mouth we have immune cells that can sample the food protein or structure. This is when the immune system can trigger a response.
Once we digest and swallow food the proteins in the structure of the food will interact with the gut. If your immune system (mostly located in the gut) sees these proteins as something foreign because they are not broken down sufficiently then the immune cells can start a response creating inflammation anywhere in the body generally at previously damaged tissue or joints.
An immediate reaction to food with symptoms of wheezing, swelling, itching, headaches and migraines are known as an IgE reaction, immunoglobulin E or food allergy. The worst case scenario is an Anaphylaxis where the windpipe feels like it is closing in and it is hard to breathe. Mast cells can be released that produce histamine and lead to stomach acid secretion and heartburn.
On the other hand a food sensitivity is a delayed food reaction and the antibodies are known as IgG, IgA or IgM. You may have done some blood tests showing these immunoglobulins. However, 99% of these tests do not test raw and cooked foods which can make all the difference because food proteins can change when cooked.
The delayed response can be anywhere from 1-3 days so keeping a food diary can really help to identify the culprit food proteins and what you are reacting to.
One of the most important factors is to have healthy digestion to prevent these reactions.. By that I mean be relaxed when eating and chew your food thoroughly before swallowing. This will help to breakdown the proteins and avoid any immune response.
If you are struggling with food reactions then please do contact me. I offer a free chat so that I can explain how I can help you.