Researchers say elevated homocysteine may be caused by some chemicals found in coffee. Those chemicals are known to increase cholesterol levels. Dr. Gary Meyerrose who is a Cardiologist says, anything in your diet that would affect your cholesterol potentially could hasten or quicken the development of coronary artery disease. So even though it's a small risk factor compared to other things we have in our lives, it's a small thing to use a filter instead of not use a filter. Studies conducted in the Netherlands show running coffee through a filter can trap harmful oils and fats.
Filters can also counteract a rise in homocysteine.
Doctors add, if you drink coffee on a regular basis, make it a point to use a filter.