Bowel problems and gluten intolerance.

I think you make a good point that maybe some problems can be diet related.
I am also glad you pointed out the difference between an "intolerance" and an "allergy" or a diagnosis of Celiac Disease.
While someone with an intolerance might be able to have a cookie they certainly have problems with a bowl of pasta..
When caring for my Husband I kept a journal (sounds so much more adult than a Diary🤣) And as a day to day note I wrote what he ate and if he was having problems with constipation or even what I called "constipated diarrhea"
So keeping notes is a good thing when you are dealing with any problem, it makes it easier to connect the dots as you get more info.

I know some people who have sensitivety (but tested negative for CD). I was curious about this so I queried ChatGPT5.3 "Why do some people develop a gluten intolerance who do not have celiac disease?" and here's what it aggregated:

"This is actually an area of ongoing research. Some people clearly develop symptoms when they eat wheat-containing foods, but they do not have Celiac disease and do not have a wheat allergy.

This condition is often called non-celiac gluten sensitivity (NCGS) or non-celiac wheat sensitivity.

The interesting part is that in some people, the problem may not actually be gluten. Possible explanations include:

1. Sensitivity to Other Components of Wheat

Wheat contains more than just gluten. It also contains:

- fructans (a type of carbohydrate)
- amylase-trypsin inhibitors
- other proteins

Some people who think they are gluten intolerant may actually be reacting to fructans.

Fructans are part of a group called FODMAPs. These can cause:

- bloating
- gas
- abdominal pain
- diarrhea
- especially in people with Irritable bowel syndrome

2. Changes in the Gut Microbiome

Researchers suspect that some people have gut bacteria that process wheat products differently, leading to:

- inflammation
- gas production
- altered bowel function

3. Increased Intestinal Sensitivity

Some people have a digestive tract that is simply more sensitive to certain foods. The gut nerves may overreact even when there is no measurable tissue damage.

4. Temporary Intolerance After Illness

Sometimes after a stomach virus, food poisoning, major illness or gastrointestinal infection people become temporarily sensitive to foods they previously tolerated well.

5. Autoimmune or Inflammatory Conditions

People with:

- Hashimoto's thyroiditis
- Type 1 diabetes
- other autoimmune disorders

sometimes report increased sensitivity to wheat-containing foods even when celiac testing is negative.

What Symptoms Do They Get? Symptoms can include:

- bloating
- diarrhea
- constipation
- abdominal pain
- fatigue
- brain fog
- headaches
- joint aches

Unlike celiac disease, there is no villous damage in the small intestine, no characteristic celiac antibodies, no increased risk of intestinal lymphoma.

Before someone decides they are "gluten intolerant," doctors usually recommend testing for celiac disease while still eating gluten. Once a person goes gluten-free, it becomes much harder to determine whether celiac disease was actually present.

In practice, many people who say they are gluten intolerant end up finding that they're really sensitive to wheat, fructans, or high-FODMAP foods, rather than gluten itself. The symptoms are real, but the underlying cause may be different from celiac disease."

"Foods High in Fructans (Often the Real Problem)

Wheat-based foods:

Bread
Pasta
Crackers
Tortillas made with wheat flour
Bagels
Pizza crust
Cereals containing wheat

Onion family (These are among the biggest triggers):

Onions
Garlic
Shallots
Leeks

Many people who think they are gluten intolerant actually react strongly to onions and garlic.

Other high-fructan foods

Artichokes
Asparagus
Brussels sprouts
Cabbage (for some people)
Chicory root/inulin
Some protein bars and fiber supplements

Foods Usually Safe on a Low-Fructan Diet

Grains and starches

Rice
Potatoes
Corn
Oats (if tolerated)
Quinoa
Proteins

Beef
Chicken
Fish
Eggs
Vegetables

Carrots
Cucumbers
Lettuce
Spinach
Green beans
Bell peppers
Fruits

Blueberries
Strawberries
Grapes
Oranges
Kiwi

A Common Pattern- Someone says: "Bread kills my stomach." Then they discover sourdough bread causes fewer symptoms, pasta is sometimes okay, but garlic bread is terrible.

That often points more toward fructans than gluten itself."

Welcome to the club.

It's so weird what can suddenly start in adulthood. My husband suddenly developed an intolerance to bananas. Later he had a septic reaction to poison ivy, which in turn lead to actual allergies of cashews and other related foods.