Veins are the tubes in the cardiovascular system that guide and carry blood back to the heart. Veins begin in the capillaries and terminate in the atria. Small veins begin in the capillaries and gradually converge during the return to the heart to form medium veins, large veins, and finally into the atria. What are the prevention methods of persistent intravenous blood flow? 1, drink green tea Green tea contains a variety of strong antioxidants that can lower cholesterol and possibly even lower blood pressure. Put 3 bags of decaffeinated green tea into 600 ml of boiling water and steep for 10 minutes, remove the tea bags, pour the green tea into a water bottle and drink it all in one day. 2.Calculate fat intake Fat intake accounts for 20% to 35% of total calories, and the fat is mainly polyunsaturated fatty acids and monounsaturated fatty acids, such as fish, nuts and vegetable oils. 3, Italian therapy More olive oil, brassica oil, of which olive oil is the best, containing more heart-healthy antioxidants. 4, eat more coarse grains Research shows that eating more fiber will reduce the risk of heart attack. So eat whole grains, cereals or oats, and take at least 25 to 35 grams of fiber a day. 5, eat fish for dinner saturated fat in meat can block blood vessels, and salmon and sardines and other fatty fish rich in omega-3 fatty acids, help maintain a stable heart rate. Eat at least twice a week rich in omega-3 fatty acids fish. 6, drink more juice Orange juice contains folic acid can reduce the risk factor for heart disease homocysteine. Grape juice contains flavonoids and resveratrol, which have antioxidant effects and can prevent red blood cells from aggregating and forming blockages. Drink 1 glass of juice for breakfast and 1 glass of juice for lunch each day. 7, eat more fresh fruits and vegetables Eat more vegetables and fruits every day. Cruciferous vegetables mainly, such as kale, Brussels sprouts, cauliflower, etc. These vegetables contain a large number of antioxidants and other heart-protective substances. 8, insist on eating nuts Eat 150 grams of nuts per week, can reduce the risk of heart disease by 1/3, but can not eat too much, otherwise it will lead to weight gain. 9, replace the bread sauce margarine contains trans fatty acids, cream contains saturated fat, can lead to artery blockage, should be replaced with plant sterols. 10, consume flaxseed Flaxseed is the most effective source of omega-3 fatty acids. Adding 2 tablespoons of flaxseed to the diet every day can prevent artery blockage and reduce the occurrence of heart disease by 46%. 11, a small amount of alcohol Studies have shown that drinking no more than 100 milliliters a day can reduce the risk of heart attack. Of course, except for alcoholics and people with high blood pressure. 12, adhere to regular exercise Studies have shown that regular daily exercise is more effective than taking the most effective cholesterol-lowering drugs, which can reduce the risk of heart attack by 50%. Simple exercises such as walking can be done for half an hour a day, four or five times a week.