Canola oil is derived from the seeds of the canola plant, which is a type of rapeseed. It is known for being low in saturated fat and high in unsaturated fats, making it a popular choice for cooking and food preparation. Canola oil contains essential fatty acids, including omega-3 and omega-6, which are beneficial for heart health (Vancouver Nutritionist).

While canola oil is generally considered safe for most people, there are several reasons why it might lead to diarrhea or other gastrointestinal disturbances in some individuals:

1. Allergic Reactions

Some people may have an allergy to canola oil, which can trigger an immune response. Symptoms of an allergic reaction can include hives, wheezing, and gastrointestinal issues such as diarrhea and stomach cramps. These reactions typically occur within two hours of consuming the allergen (Livestrong).

2. Mold Contamination

Canola oil can sometimes be contaminated with mold, especially in foods that are baked using this oil. If an individual is allergic to mold, they may experience symptoms similar to those of a canola oil allergy, including stomach upset and diarrhea (Livestrong).

3. Fat Digestion Issues

Canola oil is a high-fat substance, and fats take longer to digest compared to carbohydrates and proteins. This slower digestion can lead to bloating and discomfort, which may be accompanied by diarrhea, especially if consumed in large quantities (Livestrong). Overeating fried foods cooked in canola oil may exacerbate this issue.

4. Sensitivity to High Oleic Acid Levels

Canola oil is often refined and may contain high levels of oleic acid, which can slow down gastrointestinal transit. For some individuals, this can lead to discomfort and diarrhea (WebMD).

In addition to diarrhea, canola oil may cause other gastrointestinal side effects, such as:

Nausea
Intestinal cramps
Fatigue
Weakness (Mayo Clinic)

These symptoms can result from individual sensitivities or the consumption of low-quality canola oil, which may contain impurities or high levels of trans fats.

If you suspect that canola oil is causing gastrointestinal issues, consider the following strategies:

Keep a Food Diary: Track your food intake and any symptoms you experience. This can help identify patterns and potential triggers.
Eliminate Canola Oil Temporarily: Try removing canola oil from your diet for a few weeks to see if symptoms improve.
Consult a Healthcare Provider: If gastrointestinal issues persist, consult with a healthcare professional to explore potential allergies or sensitivities.

While canola oil is often marketed as a healthy cooking oil, it can cause digestive issues, including diarrhea, for some individuals. Allergies, mold contamination, and difficulties in fat digestion are potential culprits. If you experience adverse effects after consuming canola oil, consider moderating your intake and consulting with a healthcare professional for personalized advice. Understanding your body’s reactions can help you make informed dietary choices that support your overall health.