Research shows that eating Mediterranean or plant-based diets and staying physically active can significantly improve kidney function and blood sugar control in older adults with type 2 diabetes and chronic kidney disease. According to Gram Research analysis of 31 studies, reducing salt intake lowered blood pressure and protein in urine, while regular exercise improved blood sugar control and fitness. These lifestyle changes work best alongside medications and should be guided by your healthcare provider.
A comprehensive review of 31 studies shows that eating healthier foods and staying physically active can significantly help older adults manage both type 2 diabetes and chronic kidney disease. According to Gram Research analysis, Mediterranean diets, plant-based eating patterns, and low-sodium foods were linked to better kidney function and blood sugar control. Regular physical activity improved blood pressure and fitness levels. While medications remain important, these lifestyle changes appear to be powerful supporting tools that doctors should consider recommending to their older patients with these conditions.
Key Statistics
A 2026 systematic review of 31 studies found that Mediterranean and plant-based dietary patterns were associated with favorable kidney and metabolic outcomes in older adults with type 2 diabetes and chronic kidney disease.
Sodium restriction in older adults with type 2 diabetes and chronic kidney disease reduced blood pressure and albuminuria (protein in urine), according to evidence reviewed in a 2026 systematic analysis of 31 published studies.
Physical activity interventions improved glycemic control, blood pressure, and functional capacity in older adults with type 2 diabetes and chronic kidney disease, with possible indirect benefits for kidney function, according to a 2026 systematic review.
A 2026 systematic review of 31 studies found that moderated protein intake was associated with favorable renal outcomes in older adults with type 2 diabetes and chronic kidney disease when nutritional status was carefully monitored.
The Quick Take
- What they studied: Whether eating certain types of food and exercising regularly can improve kidney function and blood sugar control in older people who have both type 2 diabetes and chronic kidney disease
- Who participated: Analysis of 31 published studies involving older adults (age not specified in abstract) with type 2 diabetes and chronic kidney disease, combining both intervention studies where people tried new diets or exercise programs and observational studies that tracked what people naturally ate and did
- Key finding: Healthier eating patterns, especially Mediterranean and plant-based diets with less salt and moderate protein, were linked to better kidney function and blood sugar levels. Exercise programs improved blood pressure control and fitness, with possible benefits for kidney health.
- What it means for you: If you are an older adult with type 2 diabetes and kidney disease, working with your doctor to improve your diet and add physical activity to your routine may help slow disease progression and reduce complications. However, these changes work best alongside prescribed medications, not as replacements.
The Research Details
Researchers searched five major medical databases (PubMed, EMBASE, Scopus, Web of Science, and Cochrane Library) for all published studies examining how diet and exercise affect kidney function and metabolism in older adults with type 2 diabetes and chronic kidney disease. They found 31 studies that met their quality standards and analyzed what these studies showed about different eating patterns and physical activity levels.
The studies included two types of research: intervention studies where people were asked to follow a specific diet or exercise program and their outcomes were measured, and observational studies where researchers tracked what people naturally ate and did, then looked at their health results. This mix of study types allowed researchers to see both what happens when people make intentional changes and what naturally occurs in real life.
The researchers looked at how different dietary approaches affected kidney function (measured by protein in urine and kidney filtration rates) and metabolic health (blood sugar control, blood pressure, and weight). They also examined whether physical activity programs improved these same outcomes.
This approach is important because older adults with both type 2 diabetes and chronic kidney disease face serious health risks. They need practical guidance on lifestyle changes that actually work. By reviewing all available research together, scientists can see patterns across many studies rather than relying on just one study, which gives a more complete picture of what helps and what doesn’t.
This is a systematic review, which is a high-quality type of research that follows strict rules for finding and analyzing studies. The researchers registered their plan in advance (PROSPERO), which prevents bias. However, the studies they reviewed varied in quality and size, so some findings are more reliable than others. The researchers noted that stronger evidence is still needed, particularly from large, long-term studies specifically designed for older adults with these conditions.
What the Results Show
Healthier eating patterns consistently showed benefits across the studies reviewed. Mediterranean diets, which emphasize olive oil, vegetables, whole grains, and fish, were associated with better kidney function and improved blood sugar control. Plant-based diets that focus on vegetables, fruits, legumes, and whole grains also showed favorable results for kidney health and metabolism.
Sodium restriction, meaning eating less salt, was particularly effective at lowering blood pressure and reducing albuminuria, which is protein leaking into the urine (a sign of kidney damage). When people reduced their salt intake, their kidneys appeared to function better.
Moderate protein intake, meaning eating appropriate amounts of protein rather than too much or too little, was linked to better kidney outcomes. However, researchers emphasized that protein intake must be carefully monitored to ensure people get enough nutrition and don’t lose muscle mass, which is especially important in older adults.
Physical activity interventions improved multiple health markers. Exercise programs helped people control their blood sugar better, lowered blood pressure, and improved their ability to do daily activities. While the studies didn’t always directly measure kidney function improvements from exercise, the improvements in blood pressure and blood sugar suggest exercise may indirectly benefit kidney health.
The review found that antioxidant supplements, which are pills containing substances that reduce cellular damage, did not show clear benefits for kidney or metabolic outcomes. Very low-carbohydrate diets, which severely limit foods like bread, pasta, and rice, had limited and unclear evidence, meaning researchers cannot yet recommend them confidently for this population. The studies also showed that combining dietary changes with exercise appeared more effective than either approach alone.
These findings align with general diabetes and kidney disease management guidelines that emphasize lifestyle modification. However, this review specifically focused on older adults, a group that has been understudied in this area. Previous research in younger populations showed similar benefits from Mediterranean and plant-based diets, but this systematic review confirms these benefits extend to older people with both conditions. The emphasis on careful protein monitoring is newer guidance that reflects improved understanding of how older adults’ nutritional needs differ from younger people.
The review included only 31 studies, and these studies varied widely in how they were designed and conducted. Some studies were small, some lasted only a few weeks or months, and some had quality issues. The studies measured outcomes differently, making direct comparisons difficult. Most importantly, the review did not include enough large, long-term studies specifically designed for older adults with both type 2 diabetes and chronic kidney disease, so the strongest possible evidence is still missing. Individual studies may not have controlled for other factors that affect kidney health, such as medications or other health conditions.
The Bottom Line
High confidence: Work with your doctor or a registered dietitian to adopt a Mediterranean or plant-based eating pattern and reduce salt intake. Moderate confidence: Aim for moderate protein intake while ensuring adequate nutrition. Moderate confidence: Engage in regular physical activity as tolerated and approved by your healthcare provider. Low confidence: Do not rely on antioxidant supplements or very low-carbohydrate diets without medical guidance, as evidence is unclear.
This research is most relevant for older adults (typically age 65 and above) who have been diagnosed with both type 2 diabetes and chronic kidney disease. It is also important for their doctors, nurses, and dietitians who help manage these conditions. Family members supporting these individuals should also understand these recommendations. People with only diabetes or only kidney disease may benefit from some of these findings but should consult their healthcare provider for personalized advice.
Blood pressure improvements from reduced salt intake may appear within 2 to 4 weeks. Blood sugar control improvements from diet and exercise typically take 4 to 8 weeks to become noticeable. Kidney function improvements and reduction in protein in urine may take 3 to 6 months or longer to measure. Fitness and functional improvements from exercise usually appear within 4 to 8 weeks. Long-term benefits in slowing kidney disease progression would require sustained changes over months and years.
Frequently Asked Questions
Can diet and exercise help slow down kidney disease in older people with diabetes?
Research shows that Mediterranean diets, plant-based eating, and regular physical activity can improve kidney function markers and blood sugar control in older adults with both conditions. These lifestyle changes work alongside medications to help slow disease progression and reduce complications.
How much salt should someone with kidney disease and diabetes eat?
Studies show that reducing sodium intake improves blood pressure and reduces protein leaking into urine. Most guidelines recommend less than 2,300 mg of sodium daily, though your doctor may recommend lower amounts based on your individual kidney function.
What type of diet is best for older adults with diabetes and kidney disease?
Mediterranean and plant-based diets showed the strongest benefits in research. These emphasize vegetables, fruits, whole grains, legumes, and healthy oils while limiting salt and processed foods. Work with a dietitian to ensure adequate protein and nutrients for your age and health status.
How much exercise do older adults with kidney disease need?
Research supports regular physical activity to improve blood sugar and blood pressure. Aim for 150 minutes of moderate activity weekly, spread across multiple days, but start slowly and work with your doctor to find what is safe and appropriate for your fitness level.
Should older people with kidney disease take antioxidant supplements?
Current evidence does not clearly support antioxidant supplements for improving kidney or metabolic outcomes in this population. Focus on getting antioxidants from whole foods like vegetables and fruits, and discuss any supplements with your doctor before starting.
Want to Apply This Research?
- Log daily sodium intake (target under 2,300 mg per day), record minutes of physical activity completed, and track weekly blood pressure readings if available. Monitor weekly weight and note any changes in energy levels or ability to perform daily activities.
- Set a specific, achievable goal such as adding one Mediterranean-style meal per week, reducing salt in cooking by using herbs and spices instead, or committing to 150 minutes of moderate activity per week spread across multiple days. Use the app to plan meals, set activity reminders, and celebrate weekly progress.
- Establish a baseline by recording current diet patterns, activity levels, and any available kidney function or blood sugar measurements from your doctor. Check in monthly to review progress, adjust goals as needed, and share data with your healthcare provider at regular appointments. Track both objective measures (blood pressure, weight) and subjective measures (energy, how you feel) to see the full picture of improvement.
This article summarizes research findings and is not medical advice. If you have type 2 diabetes and chronic kidney disease, consult your doctor or registered dietitian before making significant dietary changes or starting an exercise program. Your healthcare provider can assess your individual kidney function, medications, and nutritional needs to create a personalized plan. Do not stop taking prescribed medications or change your treatment plan based on this information. The studies reviewed had varying quality and size, so stronger evidence is still needed for definitive recommendations in older adults.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.