Compared to the still mineral water, the drinking of sparkling water brought about significant reductions in the level of low density lipoprotein (LDL) cholesterol (generally regarded as a risk factor for heart disease), as well as a significant increase in levels of high density lipoprotein (HDL) cholesterol (generally taken to reduce heart disease risk). These and other biochemical changes induced by drinking sparkling water were estimated to reduce the women’s risk of developing heart disease over the next decade by about a third.