The human body can synthesize a variety of saturated and monounsaturated fatty acids from scratch or take them from food; however, these essential polyunsaturated fatty acids can only be taken from food because the human body lacks the enzyme dehydrogenase for synthesizing n-3 and n-6 polyunsaturated fatty acids (PUFAs). PUFAs are important components of biological membranes, and the proper ratio of n-3/n-6 in membrane phospholipids directly affects the normal activity and physiological function of biological membranes. n-3 PUFAs can cause drug aggregation in tumor cells, increase drug concentration, enhance the cytotoxic effect of drugs, and enhance the sensitivity of tumor cells to chemotherapy. n-3 PUFAs can inhibit tumorigenesis and metastasis, and at the same time also promote the apoptosis of tumor cells. Almost all frequently consumed vegetable oils, such as corn oil, sunflower oil, safflower oil, and olive oil, are rich in linoleic acid (n-6 series). What foods are rich in n-3 polyunsaturated fatty acids? a-linolenic acid is the precursor of n-3 polyunsaturated fatty acids. You can consume more plants rich in a-linolenic acid, including soybeans, walnuts, dark green leafy vegetables such as kale, spinach, broccoli, seeds of hugging kale, etc. Some oils, such as linseed oil, mustard seed oil, canola oil, are also rich in a-linolenic acid, as well as linoleic acid. DHA and EPA are the two most important unsaturated fatty acids for the human body among n-3 unsaturated fatty acids. Deep-sea cold-water fish, such as mackerel, tuna and salmon, contain the highest amount of DHA and EPA. With the in-depth research on the anti-tumor effects of fatty acids and their low side effects, especially the obvious advantages of n-3 PUFAs in anti-tumor, they will surely be welcomed as natural anti-tumor drugs. The improper ratio of n-6/n-3 in the diet is an important factor that may contribute to tumorigenesis, and the recommended ratio is (4-6):1. Therefore, patients with tumors should choose a variety of fats and oils, including n-6 polyunsaturated fatty acids, n-3 polyunsaturated fatty acids, and monounsaturated fatty acids, etc. This is conducive to maintaining the inflammatory balance and reducing lipid peroxidation in tumor patients, and therefore, it is recommended that a variety of vegetable oils be used alternately. Use.