Because there are certain differences in the nutritional composition of various cooking oils, long-term single consumption of canola oil may lead to nutritional imbalance, so long-term consumption of canola oil is not recommended. Moreover, if a person consumes canola oil for a long time or consumes a large amount of canola oil for a long time, it may also have certain adverse health effects. Although canola oil is rich in unsaturated fatty acids, vitamins, minerals and other nutrients, it lacks some of the essential fatty acids such as linoleic acid, which may cause an imbalance in nutritional intake over time. Some of the consumers may choose the earth-pressed rapeseed oil, which has not been refined, there may be harmful substances such as erucic acid and other excessive, long-term consumption may have a bad impact on the health of the consumer, such as causing thickening of the blood vessel wall and myocardial fat deposition, so it is recommended to choose refined rapeseed oil to eat in moderation. In addition, long-term consumption of large amounts of canola oil may produce fat accumulation, thus causing obesity and other conditions, especially for patients with hyperlipidemia, coronary heart disease, hypertension, if long-term consumption of too much may aggravate the condition. It is recommended that people alternately choose a variety of oils, such as olive oil, peanut oil and soybean oil, for food preparation on a daily basis, which is more beneficial to human health. No matter which cooking oil is not recommended to be consumed in excess, there is a risk of excessive fat intake, and it is also not recommended to consume oil that has been placed too long or heated repeatedly to avoid adverse effects on the organism.