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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
Here are some good tips: 1  Sunshine. Sunshine has been found to maximize circulation and to keep the blood thin. 2  Exercise. People who exercise too much run the risk of having vitamin K levels that are too low. 3  Avoid foods that thicken the blood. There are some foods that cause the blood to thicken. These include kale, spinach, collard greens, parsley, cauliflower, asparagus, leeks, and celery.