The human body is made up of over 60% water. Your heart has an even higher percentage of water than that, coming in at about 73% (the same ratio as the brain, actually). With many studies proving the health benefits of water when it comes to overall health, has there been a consensus on the specific effects drinking water has on the heart?

Yes, scientists are very aware of the effects of high sodium levels leading to an increased risk of heart disease. Having fewer liquids in your body results in dehydration, further rising the sodium levels in your blood. Because of this, there exists a direct relationship between healthy cholesterol levels and drinking water. If we do not drink a sufficient amount of water on a daily basis, the kidneys and other organs are unable to properly function. If the blood is to flow properly around the body, sufficient water is required, particularly following meals when the nutrients from food need to travel to the body’s cells.
If there is not enough water, the body isn’t properly able to remove excess cholesterol from the arteries, increasing the chance of developing coronary heart disease or having a stroke.
There are other factors that can lead to heart problems as well. In a recent study by the European Society of Cardiology, the study authors listed climate change as an additional stressor. “High air temperatures on single hot days and during heatwaves pose risks to health, either directly by causing dehydration or heatstroke, or indirectly via pathways such as worsening of cardiorespiratory diseases (CPD), kidney diseases, or electrolyte disorders.”
Water intake is especially important during physical activity when your heart rate is elevated. When you become dehydrated, the amount of blood circulating decreases, adding strain to your cardiovascular system. This means it has to work harder to pump blood. It’s especially important to avoid sports drinks with added sugars or energy drinks when dehydrated. These caffeinated drinks can act as a diuretic, effectively flushing water from your system. That’s NOT what your body needs and can negatively affect several bodily functions.