Is blood like your waistline - the thinner, the better?

Is blood like your waistline — the thinner, the better?

An interesting theory proposes that watering down your blood can prevent heart disease. Don't overdo it.

The old adage "Blood is thicker than water" makes sense for family ties. For the heart and circulatory system, though, thinner, more watery blood might be better.

Some tantalizing threads of evidence suggest that people with thicker (or more viscous) blood have higher chances of developing heart disease or having a heart attack or stroke. Viscosity measures a fluid's resistance to flow; honey, for example, is more viscous than water. The more viscous the blood, the harder the heart must work to move it around the body and the more likely it is to form clots inside arteries and veins.

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