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Global study indicates that an ignored environmental factor may be behind the increase in blood pressure in coastal populations, with silent impacts on cardiovascular health
The relationship between salt consumption and high blood pressure is already well known. However, a recent alert made by a public health researcher reveals an unexpected factor that may be impacting billions of people: drinking water.
The information was disclosed by The Conversation, based on an analysis conducted by researcher Rajiv Chowdhury from Florida International University, who investigated the relationship between water salinity and blood pressure in different populations around the world.
Contrary to what many might think, this is not a problem related to individual choices, such as diet or lifestyle. On the contrary, it is a silent environmental factor that may be significantly contributing to the global increase in hypertension.
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How hidden salt in drinking water can raise blood pressure
When it comes to hypertension, factors such as a sodium-rich diet, sedentary lifestyle, and smoking are usually the most cited. However, as climate change progresses, a concerning phenomenon has been intensifying: the intrusion of saltwater into freshwater sources.
This process mainly occurs in coastal regions, where rising sea levels cause saltwater to invade underground aquifers. As a result, there is an increase in the concentration of dissolved salts—especially sodium—in the water used for drinking and cooking.
Moreover, the problem is exacerbated because this salinity is not always perceptible to the palate. In other words, millions of people may be consuming high amounts of sodium daily without even realizing it.
This scenario is even more alarming when considering that over 3 billion people live in coastal or near-coastal regions, many of them in low- and middle-income countries, where groundwater is the main source of supply.
Scientific data reveals real increase in hypertension risk
To investigate this possible relationship, the team led by Rajiv Chowdhury conducted a systematic review and meta-analysis that gathered data from 27 population studies, involving more than 74,000 participants from countries such as the United States, Australia, Israel, Bangladesh, Vietnam, Kenya, and various European nations.
The results indicated a consistent pattern: individuals exposed to higher levels of salinity in drinking water showed a significant increase in blood pressure.
On average, the data showed:
- Increase of 3.22 mmHg in systolic pressure
- Increase of 2.82 mmHg in diastolic pressure
Additionally, exposure to water with higher salt concentration was associated with a 26% increase in the risk of developing hypertension, with an even more intense impact on coastal populations.
Although these increases may seem small individually, experts warn that, on a population scale, these variations can have significant consequences for public health.
For comparison, the impact of water salinity is similar to factors such as sedentary behavior, which raises the risk of hypertension by 15% to 25%.
Climate change may exacerbate the problem in the coming years
Another critical point highlighted by the study is the direct relationship between this phenomenon and climate change. With the continuous rise in sea levels, the trend is that saltwater intrusion into freshwater sources will intensify in the coming decades.
This may further increase the number of people exposed to risk, turning this environmental factor into one of the major global public health challenges.
Despite this, there are still significant gaps in scientific knowledge. According to the researcher himself, there are few studies assessing the long-term effects of saline water intake on more severe cardiovascular diseases, such as heart attacks and strokes.
Moreover, the World Health Organization currently does not set a health-based limit for sodium levels in drinking water, which reinforces the need for further research on the topic.
Why this environmental factor is still under-considered
Historically, hypertension prevention strategies have focused almost exclusively on behavioral factors. However, the evidence gathered by Rajiv Chowdhury shows that environmental factors also play a relevant role and need to be considered.
Although diet continues to be the main source of sodium for most people, drinking water can represent a significant contribution, especially in regions affected by salinization.
In this context, experts recommend that the population, whenever possible, consult local water quality reports and pay attention to total sodium consumption.
In addition, scientific platforms such as ScienceAlert have also been reinforcing the importance of the topic, highlighting that the impact of water salinity can be comparable to other widely recognized risk factors.
In light of a global scenario marked by accelerated environmental changes, understanding this type of exposure may be essential to reduce the impact of hypertension and improve cardiovascular health on a large scale.
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