25% to 35% of the population has one form of intolerance to gluten (wheat et.al. grains) and dairy.

If you fall anywhere in that 35%, Pizza is poison.

When the body cannot digest gluten and/or wheat, those foodstuffs either will pass through the digestive track un-digested or partially digested, resulting in lower track distress. Oddly, some people with gluten intolerance will suffer diarrhea, while others have constipation, and still others a combination of both known as IBS (Irritable Bowel Syndrome), a binge and purge disorder of diarrhea followed by constipation, or constipation followed by diarrhea.

The partially un-digested food can produced mood swings and behavior changes, as with any toxin ingested that the body cannot metabolize, such as alcohol. Alcohol is a toxin, hence the condition known as intoxication. An average healthy human male, over the age of 21 (the age at which the average human male's organs have matured), can metabolize one ounce of alcohol per hour, women somewhat less.

Intolerances to air and food stuffs grow over time, and change over time as the body matures, and regresses. Long term exposure to alcohol, in amounts greater than one ounce per day or more, degrades all organs in the body, by breaking down and weakening cell walls in organs, thus accelerating any changes in the body's ability to function.

Sometimes changes are subtle over time, at other times more immediate, seemingly more catastrophic. Like all of a sudden not feeling well when eating certain foods.