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HELSINKI, Finland – Consuming excessive amounts of salt could increase the odds of developing obesity by more than 300%, according to new research from Finland. The study highlights a significant association between high dietary sodium intake and increased risks of both general and abdominal obesity.
The findings are scheduled for presentation at the European Congress on Obesity (ECO 2025) in Malaga, Spain, from May 11-14. The research was led by Annika Santalahti of the Finnish Institute for Health and Welfare in Helsinki.
The study differentiates between general obesity, defined by the World Health Organization (WHO) as a Body Mass Index (BMI) of 30 kg/m² or higher, and abdominal obesity, characterized by excess fat around the abdomen and internal organs. Abdominal obesity is considered particularly dangerous due to its strong link to cardiovascular disease.
Researchers analyzed data from 5,014 Finnish adults (2,222 men, 2,792 women) participating in the National FinHealth 2017 Study. Sodium intake was assessed using food frequency questionnaires, while spot urine samples were collected from a subset of participants to measure urine sodium concentration. General and abdominal obesity were measured using BMI and waist circumference, respectively.
The results indicated that salt consumption was generally high across the study population. Except for women in the lowest intake group (quartile), all participants exceeded the WHO’s recommended daily limit of 5 grams of salt (equivalent to about 2000 mg of sodium). Men and women in the highest intake quartile consumed roughly 2.3 times more sodium than those in the lowest quartile. Specifically, men in the highest quartile averaged over 12 grams of salt daily (approx. 4900 mg sodium), more than double the WHO recommendation, while women averaged over 9 grams daily (approx. 3750 mg sodium), nearly double the limit.
The study found a strong correlation between higher sodium levels and obesity, particularly in women. After adjusting for various sociodemographic and lifestyle factors, women in the top 25% for sodium intake were found to be 4.3 times more likely to have general obesity and 3.4 times more likely to have abdominal obesity compared to women in the lowest 25%. Similar strong associations were found when using urine sodium concentration data, with women in the highest quartile being 4.8 times more likely to have general obesity.
While men showed a similar trend based on self-reported dietary intake, the results weren’t statistically significant across all groups. However, when analyzing urine sodium concentration, the link was clear and statistically significant for men. Those in the highest quartile for urine sodium were 6 times more likely to have general obesity and 4.7 times more likely to have abdominal obesity compared to men in the lowest quartile.
Researchers noted that higher overall food consumption in men, particularly of processed meats, bread, and cheese – major sodium sources in Finland – likely contributes to their higher intake. “Contrary to popular belief, high sodium intake is not mainly caused by unhealthy foods, but by ordinary everyday food,” the authors stated, emphasizing the need for population-level changes in cooperation with the food industry.
The biological mechanisms linking high salt intake and obesity remain unclear, though researchers suggest possibilities including effects on satiety hormones or salt acting as a marker for lower overall diet quality, potentially reflecting higher consumption of ultra-processed foods. “Research data is still very limited,” the authors noted, calling for further investigation into these mechanisms, including effects on the gut microbiome and body composition.
“These results strengthen the evidence of an association between sodium intake and obesity,” the authors concluded, stressing the importance of addressing sodium levels in commonly consumed foods through collaboration with the food industry to impact public health.
Disclaimer: This article reports on findings scheduled for presentation at a scientific conference. The research should be considered preliminary until published in a peer-reviewed journal. The study identifies an association between high sodium intake and obesity; it does not definitively prove causation. The findings are based on a specific population (Finnish adults) and may not be directly generalizable to all populations.
