Adding additional salt to foods at a lower frequency is associated with a reduced risk of heart disease, heart failure and ischemic heart disease, according to a new study published in the Journal of the American College of Cardiology. Even among those following a DASH-style diet, behavioral interventions to lessen salt consumption could further improve heart health.
There’s substantial evidence linking high sodium intake to high blood pressure, a major risk factor for cardiovascular disease. However, epidemiological studies investigating this link have produced conflicting results due to a lack of practical methods for assessing long-term dietary sodium intake. Recent studies suggest that the frequency at which an individual adds salt to their foods could be used to predict their individual sodium intake over time.
In the current study, the authors evaluated whether the frequency of adding salt to foods was linked with incident heart disease risk in 176,570 participants from the UK Biobank. The study also examined the association between the frequency of adding salt to foods and the DASH diet as it relates to heart disease risk.
The study used a questionnaire at baseline to collect data on the frequency of adding salt to foods, not including salt used in cooking. Participants were also asked if they had made any major changes to their diet in the last 5 years, as well as complete 1-5 rounds of 24-hour dietary recalls over a three-year period.
The DASH-style diet was developed to prevent hypertension by limiting consumption of red and processed meats and focusing on vegetables, fruit, whole grains, low-fat dairy, nuts, and legumes. While the DASH diet has yielded benefits in relation to reducing cardiovascular disease risk, a recent clinical trial found that combining the DASH diet with sodium reduction was more beneficial for certain cardiac biomarkers, including cardiac injury, strain, and inflammation. The researchers calculated a modified DASH score that did not consider sodium intake based on seven foods and nutrients that were emphasized or deemphasized in the DASH-style diet.
Data on heart disease events was collected through medical history and data on hospital admissions, questionnaire and death register data.
Overall, study participants with a lower frequency of adding salt to foods were more likely to be women; white; have a lower body mass index; more likely to have moderate alcohol consumption; less likely to be current smokers; and more physically active. They also had a higher prevalence of high blood pressure and chronic kidney disease, but a lower prevalence of cancer. These participants were also more likely to adhere to a DASH-style diet and consumed more fruits, vegetables, nuts and legumes, whole grains, low-fat dietary but less sugar-sweetened drinks or red/processed meats than those with a higher frequency of adding salt to foods.
The researchers found the association of adding salt to foods with heart disease risk was stronger in participants of lower socioeconomic status, as well as in current smokers. A higher modified DASH diet score was associated with lower risk of heart disease events.