What Does Food Intolerance Look Like?
Signs and symptoms can include headache/migraine, joint pains, fatigue, sleepiness, heart palpitations, depression, irritability, stomach pains, bloating, and many more.
Because digested food moves through the bloodstream, the effects of an intolerance can show up virtually anywhere in the body.
Food reactions might be the same every time the food is eaten, such as a rash.
Or the reactions might vary – say, a non-itchy rash one time and itching with no rash another time.
The reaction might be cumulative. Maybe a small portion of the food causes no reaction, but a portion eaten again that day, or several days in a row, does causes one.
Addiction is another possible reaction that may develop over time.
What Causes Food Intolerances?
The causes are many, but let’s keep it simple.
One cause is a genetic intolerance or a tendency toward it.
We can become intolerant to a food we eat often or in large quantities. Overeating a food uses up enzymes specific to digesting that food, so complete digestion is prevented.
That may result in improperly digested food particles moving through the digestive tract and bloodstream, triggering an immune reaction. The undigested, unabsorbed food provides no nutrients.
We can also become reactive to a food we eat together with another triggering food. So the list of triggering foods may grow, resulting eventually in malnutrition.
Food Reactions May Change Over Time
The guiding principle of the human body is homeostasis.
When a trigger food is first eaten, the body attempts to restore homeostasis by ridding itself of the offending food. It prevents absorption by attaching antibodies to the partially digested food while it’s in the intestine. That might successfully eliminate the food before it can pass into the bloodstream.
If the food does enter the bloodstream, it can trigger inflammation. The acute reaction may be short, and the body may return to homeostasis quickly.
If someone continues to eat a triggering food over time, the body undergoes an adaptation. The immune system may become slower (or less able) to respond. The reaction may now manifest more slowly than the acute reaction. Signs or symptoms may last longer, sometimes hours or days.
How Can That Become a Food Addiction?
The immune response to a triggering food addiction involves a release of stress hormones, opioids, such as endorphins (beta-endorphin), and chemical mediators like serotonin. The combination can produce temporary symptom relief through the analgesic action of endorphin and serotonin, plus mood elevation and a feeling of relaxation.
In that way, eating the triggering food may make someone feel better almost immediately and even think the food is beneficial.
Endorphin release typically involves a concomitant release of dopamine. The combination of those two brain chemicals and serotonin forms what I’ve always called the “addictive package.” Avoiding the food could lead to withdrawal.
After long-term use, someone may eat the triggering food not to experience the pleasure of the chemical “high,” but to relieve the distress and withdrawal without it. It’s almost textbook addiction.