According to Gram Research analysis, people who consume the most salt have 2.66 times higher risk of developing type 2 diabetes compared to those eating the least salt. A 2026 cohort study of 3,173 adults found that each additional 1,000 mg of daily sodium intake increased diabetes risk by 32% over 13.6 years of follow-up. Reducing salt intake while eating more potassium-rich foods may help prevent diabetes, though more research is needed to confirm causation.
A new study of over 3,000 adults found that people who eat too much salt have nearly three times the risk of developing type 2 diabetes compared to those who eat less salt. Researchers measured actual salt intake using urine samples over many years, which is more accurate than asking people what they eat. The study also found that the balance between salt and potassium matters—eating more potassium-rich foods like bananas and leafy greens while cutting back on salt may help protect against diabetes. This research suggests that reducing salt intake could be an important way to prevent diabetes, though more studies are needed to confirm these findings.
Key Statistics
A 2026 cohort study of 3,173 adults published in Diabetes Care found that people in the highest sodium intake group had 2.66 times higher risk of developing type 2 diabetes compared to the lowest intake group over 13.6 years of follow-up.
According to research reviewed by Gram, each additional 1,000 mg of daily sodium excretion was associated with a 32% higher risk of type 2 diabetes in a study of 3,173 participants followed for a median of 13.6 years.
A 2026 study of 3,173 adults found that each unit increase in the sodium-to-potassium ratio was associated with a 26% higher risk of developing type 2 diabetes, suggesting the balance between these minerals matters for diabetes prevention.
Among 3,173 participants followed for 13.6 years, 161 developed type 2 diabetes, with those consuming the highest salt having significantly elevated risk compared to low-salt consumers, according to a 2026 analysis in Diabetes Care.
The Quick Take
- What they studied: Whether eating too much salt or too little potassium increases the chances of developing type 2 diabetes
- Who participated: 3,173 healthy adults with an average age of 62 years (69% were women) who were followed for about 13.6 years
- Key finding: People who ate the most salt had 2.66 times higher risk of diabetes than those who ate the least salt. For every extra 1,000 mg of salt per day, diabetes risk went up by 32%.
- What it means for you: Cutting back on salty foods may help lower your chances of getting type 2 diabetes, especially if you’re middle-aged or older. This is particularly important if diabetes runs in your family. However, this study shows a connection, not proof that salt causes diabetes.
The Research Details
Researchers followed 3,173 adults without diabetes for an average of 13.6 years. Instead of asking people what they ate (which is often inaccurate), they measured actual salt and potassium levels in urine samples collected 2-4 times per person. This method is much more reliable because it shows what people actually consumed, not what they remember eating. The researchers then tracked who developed type 2 diabetes and compared their salt intake to those who stayed healthy.
The study included people from three different research groups, which makes the findings stronger because they weren’t just looking at one group of people. The researchers carefully adjusted their results to account for other factors that affect diabetes risk, like age, weight, exercise, and overall diet quality.
Most previous studies asked people to remember what they ate, which leads to mistakes. This study used urine measurements, which is like having a scientific record of what people actually consumed. This more accurate method helps us understand the real connection between salt intake and diabetes risk. The long follow-up period (over 13 years) also matters because it shows whether salt intake today predicts diabetes years later.
This study is strong because it measured salt intake multiple times per person rather than just once, it followed people for many years, and it adjusted for many other health factors. However, the study shows a connection between salt and diabetes, not definite proof that salt causes diabetes. The researchers note that other unmeasured factors could partly explain the results. The study included mostly older adults, so results might differ in younger people.
What the Results Show
Among the 3,173 participants, 161 people developed type 2 diabetes during the study. People in the highest salt-eating group had 2.66 times higher risk of diabetes compared to the lowest salt-eating group. This means if 10 people in the low-salt group developed diabetes, about 27 people in the high-salt group would develop it.
When researchers looked at salt intake as a continuous measure, each additional 1,000 mg of salt per day (roughly the amount in 2.5 teaspoons of table salt) was linked to a 32% increase in diabetes risk. This suggests that even moderate increases in salt intake matter.
Interestingly, potassium intake alone wasn’t strongly connected to diabetes risk. However, the ratio of salt to potassium was important—people with the highest salt-to-potassium ratio had 26% higher diabetes risk for each unit increase in the ratio. This suggests that what matters most is eating less salt while maintaining adequate potassium from foods like fruits and vegetables.
The study found that the relationship between salt and diabetes was consistent across different age groups and genders, suggesting this finding applies broadly. The effect of high salt intake appeared stronger in people with certain characteristics, though the study didn’t have enough detail to identify exactly which groups were most vulnerable.
Previous research suggested that high salt and low potassium might increase diabetes risk, but studies relying on people’s memory of what they ate gave mixed results. This study provides stronger evidence because it used objective urine measurements. The findings align with what we know about salt and heart disease—high salt intake raises blood pressure and may harm the body’s ability to use insulin properly, which is the underlying problem in type 2 diabetes.
The study shows a connection between salt intake and diabetes but cannot prove that salt directly causes diabetes. Other factors not measured in the study could explain some of the connection. The participants were mostly older and relatively healthy at the start, so results might differ in younger people or those with existing health problems. The study measured salt intake at only a few points in time, so it couldn’t track how salt intake changed over the 13+ years of follow-up.
The Bottom Line
Based on this research, reducing salt intake appears beneficial for diabetes prevention, particularly for middle-aged and older adults. The American Heart Association recommends less than 2,300 mg of sodium per day, and this study suggests even lower intake may be better. Simultaneously increasing potassium-rich foods (fruits, vegetables, beans) may provide additional benefit. Confidence level: Moderate—this study provides good evidence, but more research would strengthen these recommendations.
This research is most relevant for people over 50, those with family history of diabetes, people with high blood pressure, and anyone concerned about diabetes prevention. It’s less clear whether these findings apply to younger adults or people with very different diets. People with kidney disease should consult their doctor before significantly changing potassium intake.
Changes in diabetes risk from reducing salt intake would likely take months to years to become apparent, similar to how blood pressure improvements typically take 4-6 weeks. This isn’t a quick fix but rather a long-term dietary change for disease prevention.
Frequently Asked Questions
Does eating too much salt cause type 2 diabetes?
High salt intake is strongly linked to increased diabetes risk—people eating the most salt had nearly 3 times higher risk in a recent study. However, this shows a connection, not definite proof of cause. Other factors may also play a role, so reducing salt is one of several ways to lower diabetes risk.
How much sodium should I eat to prevent diabetes?
The American Heart Association recommends less than 2,300 mg daily, but this study suggests even lower intake may be better for diabetes prevention. Most people consume 3,000-4,000 mg daily, so cutting back by 25-50% could meaningfully reduce your risk.
Is potassium as important as reducing salt for diabetes prevention?
Potassium alone wasn’t strongly linked to diabetes risk in this study, but the balance between salt and potassium matters. Eating potassium-rich foods while reducing salt appears more protective than either change alone. Focus on both: less salt and more fruits, vegetables, and beans.
What are easy ways to eat less salt without giving up tasty food?
Choose low-sodium versions of packaged foods, use herbs and spices instead of salt for flavor, cook at home more often, and limit processed meats and canned foods. Gradually reducing salt helps your taste buds adjust within 4-6 weeks, making lower-salt foods taste normal.
Can I reverse diabetes risk by changing my salt intake?
Reducing salt intake may help prevent diabetes from developing, but this study doesn’t show whether it reverses existing diabetes. For people already diagnosed, salt reduction is still beneficial for blood pressure control and overall heart health, but medication and other lifestyle changes are usually needed.
Want to Apply This Research?
- Track daily sodium intake in milligrams and potassium intake separately. Set a goal of under 2,300 mg sodium daily and aim for 3,500+ mg potassium daily. Log these weekly to identify patterns in high-salt foods and low-potassium meals.
- Replace one high-salt food daily with a potassium-rich alternative—for example, swap processed snacks for bananas, add leafy greens to meals, or choose low-sodium versions of canned foods. Track which swaps feel easiest to maintain long-term.
- Monthly review of average daily sodium and potassium intake. Set reminders to check nutrition labels on packaged foods. Track any changes in energy levels, blood pressure (if measured at home), or weight as secondary indicators of dietary improvement.
This research shows an association between high salt intake and increased diabetes risk but does not prove salt directly causes diabetes. These findings are most relevant for adults over 50 and should not replace personalized medical advice. Anyone with kidney disease, heart failure, or taking medications that affect potassium levels should consult their healthcare provider before making significant dietary changes. This article is for educational purposes and should not be considered medical advice. Always discuss dietary changes with your doctor, especially if you have existing health conditions or take medications.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.