Before my doctoral program - which required me to narrow down to a specialty (sugar addiction) - I had studied food intolerances.

Many books on the subject start with food reactions, then move into chemicals in our homes and offices, gasoline fumes, and more. Important as those things are, they're not about nutrition.

My interest in food intolerances has always been their link with addiction.

Recently, I "attended" a webinar by J.J. Virgin, whose first book (I believe) was on food intolerances and how to eliminate those foods to improve health and lose weight. The webinar re-sparked my interest in food intolerance and addiction.

Common triggers Steamboat Sets for food intolerance include chocolate, corn, soy, wheat (or other gluten-containing foods), peanuts, dairy, eggs, sugars and other sweeteners.

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.