Posted on July 24, 2015; by J. "People in countries that consume olive and sunflower oil have the lowest rate of asthma and those that consume soybean, corn and canola oil have the highest rate of asthma," Cook-Mills said. Canola oil is mixed up into those creamy salads such as potato and macaroni salads; yes, … Canola oil contains a high sulfur content, which can contribute to its volatility and susceptibility to becoming rancid. However, canola oil may cause stomach aches for one of several reasons. Carver; in Respiratory Issues; Many health conscious individuals have been using canola oil as a healthy alternative to the commonly used types of oil in the market today. Canola oil allergy. Scientists from Temple University researched the impact of canola oil on brain health. Consuming rancid oil triggers allergies by stimulating the production of histamines and other inflammatory immune cells that exacerbate allergies and conditions like asthma. Science shows canola oil is bad for your brain. Allergies & Asthma. Polyunsaturated fat is the main source of DNA-disrupting free radicals, omega-6 fatty acids which kill your thyroid and spiking inflammation. Canola oil, popularly used at those all you can eat buffet bars, can have some seriously negative effects on your health, especially that GMO canola oil that Monsanto manufactures. Canola oil has been deemed as one of the healthiest oils to use for cooking because it is low in saturated fat and high in unsaturated fat. Canola oil is one of the most widely used cooking oils. Canola’s poly unsaturated fatty acids (PUFA) suppress thyroid function. 5.