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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
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.