The Science Behind Salt: Can Salt Shorten Your Lifespan?

Nutrition Corner with Dr D 

The Science Behind Salt: Can Salt Shorten Your Lifespan?

Can extra salt shorten your life span ? Salt, one of the most common ingredients we use in cooking, has a significant impact on our health. Several recent studies have highlighted the potential risks of consuming extra salt, suggesting that it could shorten life expectancy. In this article, we will dissect these findings and provide our perspective on the impact of salt intake on human health and longevity.

The Intriguing Connection Between Salt and Life Expectancy

A research study published in the European Heart Journal has brought to light some alarming statistics. It indicates that individuals who habitually add extra salt to their meals after cooking could have a 28% increased risk of premature death compared to those who refrain from adding additional salt.

 

More surprisingly, this study has found a correlation between the habit of adding extra salt to meals and a decreased life expectancy at the age of 50 — specifically, 1.5 years lower for women and slightly more than 2 years lower for men.

 

These findings have created a stir in the media and led to various debates. Let's delve deeper to understand these results and their implications better.

Underlying Mechanisms: How Does Salt Impact Our Health?

Our bodies require a small amount of salt for normal functioning. However, excessive salt intake may lead to high blood pressure, which subsequently increases the risk of heart disease and stroke.

 

The research study in question has used the habit of adding extra salt to food as a measure of salt intake. The practice is a reflection of salt consumption, not necessarily because table salt is worse than the salt already present in our food.

 

To further validate this claim, the study also found that people who added salt (sodium chloride) to their meals had a higher concentration of sodium in their urine, which is indicative of a higher overall salt intake.

 

The Role of Dietary Habits: High-Potassium Foods vs Salt

Another interesting finding of this study is the potential counteracting effect of high-potassium foods. Consuming a diet rich in fruits and vegetables, which are excellent sources of potassium, could possibly help reduce the increased risk of premature death associated with high salt intake.

The Challenges of Measuring Salt Intake

The study uses a relatively novel approach to measure salt intake, focusing on whether individuals add extra salt to their food. While it has its limitations — for instance, it does not account for salt added during cooking or salt in different food types such as cheese, sauces, or pickles — it still provides a good measure of a person's preference for salt.

 

Moreover, the researchers also used random urine samples from some participants and 24-hour dietary recalls to account for daily dietary differences, providing a more comprehensive overview of salt intake.

 

Evaluating the Study: Strengths, Limitities and Potential Bias

The study was built on a large sample-size from across the UK and used reliable sources of information. Nevertheless, it's important to remember that this type of study can only demonstrate a correlation, not causation. It's unclear whether adding salt to food directly causes early death, or whether it's simply an indicator of an overall unhealthy lifestyle.

One limitation is that the participants were all based in the UK, aged between 40 and 69, and were volunteers, which may not represent the whole population.

 

One notable point is that the risk of early death is specifically linked to those who "always" add extra salt to meals after cooking. Therefore, it is essential to approach these findings with a critical mind and to consider the overall context.

 

Conclusion: A Balanced View on Salt Intake

The research findings do not entirely negate the role of salt in our diet. However, it suggests the importance of moderation. Most people unknowingly consume excess salt due to its hidden presence in processed foods. Therefore, efforts should be made both at the individual and the governmental level to reduce overall salt intake.

 

As with most things in life, balance is key. Incorporating potassium-rich foods in our diet and reducing the use of extra salt in meals could contribute to a healthier lifestyle and potentially increase our life expectancy.

 

While further studies are needed to substantiate these findings, one thing is clear: our dietary habits significantly influence our health and longevity. It's essential to remain mindful of these habits and make necessary adjustments to promote better health.


Salt Intake Linked to Atherosclerosis Even With Normal BP

Medicine Corner with Dr D 

Salt Intake and atherosclerosis - High Salt Intake Linked to Atherosclerosis Even With Normal Blood Pressure

A recent study conducted in Sweden has found even closer relationship between salt intake and atherosclerosis than thought before. The researchers found that  Salt Intake can increase the risk of atherosclerosis, even in individuals with normal blood pressure. The study, published on March 30th in the European Heart Journal Open, analyzed data from the Swedish Cardiopulmonary bioImage Study, which included over 10,000 participants aged 50 to 64 years. The study found that high salt consumption was strongly linked with the development of atherosclerotic lesions in the coronary and carotid arteries.

The lead researcher of the study, Dr. Jonas Wuopio from Karolinska Institutet and Uppsala University, stated that while the link between salt and hypertension is known, the role of salt in atherosclerosis has not been studied in detail. The researchers used advanced imaging technology to study calcification changes in the arteries and atherosclerotic plaques, and the association with salt intake.

 

The study used coronary computed tomography angiography (CCTA) to obtain 3D images of the coronary arteries and measure the degree of coronary artery calcium, as well as detect stenosis in the coronary arteries. Participants also had an ultrasound of the carotid arteries. The estimated 24-hour sodium excretion was used to measure sodium intake.

The researchers found that increasing salt consumption was linked with an increase in atherosclerosis in both the coronary and carotid arteries. Each 1000 mg rise in sodium excretion was associated with a 9% increase in the occurrence of carotid plaque, a higher coronary artery calcium score, and a 17% increase in the occurrence of coronary artery stenosis.

 

The researchers noted that the association disappeared after adjusting for blood pressure. They suggest that the increase in blood pressure from sodium intake, even below the level that currently defines arterial hypertension, is an important factor that mediates the interplay between salt intake and the atherosclerotic process. However, they caution that no causal relationships can be drawn from this cross-sectional study.

 

The study also found no evidence of a J-curve phenomenon, which some studies suggest that very low sodium intake is linked to an increased risk of cardiovascular disease-related events. Participants with the lowest levels of sodium excretion had the lowest occurrence of both coronary and carotid atherosclerosis. The researchers suggest that excess salt is not good and that salt intake might be a risk factor for atherosclerosis even before the development of hypertension.

According to Dr. Alon Gitig, a cardiologist at Mount Sinai Doctors-Westchester, Yonkers, New York, not all studies have suggested that high salt intake tracks with the risk for atherosclerotic disease. Most studies of salt intake in the diet are based on patient self-reports via food frequency questionnaires, which can give a general idea of salt intake but may not be accurate. The Swedish Cardiopulmonary bioImage Study used a more reliable method by measuring the participants' 24-hour sodium excretion.

 

In conclusion, the study suggests that high salt intake increases the risk of atherosclerosis, even in individuals with normal blood pressure. The study used advanced imaging technology to study calcification changes in the arteries and atherosclerotic plaques, and the association with salt intake.

While the association disappeared after adjusting for blood pressure, the researchers suggest that the increase in blood pressure from sodium intake, even below the level that currently defines arterial hypertension, is an important factor that mediates the interplay between salt intake and the atherosclerotic process. This study highlights the need for further research into the relationship between salt intake and atherosclerosis.

 

Atherosclerosis usually go hand in hand with diabetes. Making sure that you maintain healthy weight and stay in good physical shape will further help you prevent developing both diabetes and Atherosclerosis.