Not all vegetable oils are as ‘heart healthy’ as they claim to be: some vegetable oils such as corn and safflower oil, may actually harm your heart, according to a Canadian study.

In the study, researchers analysed information from the Sydney Diet Heart Study which comprised of 458 participants. In the intervention group, in which participants had to reduce consumption of saturated fat and increase intake of safflower oil and safflower margarine, cholesterol levels were 8% to 13% lower than in the control group. Safflower oil is rich in omega-6 linoleic acid but low in the omega-3 alpha-linolenic acid, as is corn oil.  The intervention group also had a 6% higher risk of cardiovascular and coronary heart disease, and a 5, 8% higher risk of all-cause mortality compared to the control group. However, not all vegetables oils are bad for your heart.