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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.
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. You shouldn't eat these foods if you want to have thin blood.