# Nutrition in diabetes with severe complications
Mediterranean dietary pattern
ResearchediPositive results in clinical studies, not yet standard treatment
The Mediterranean dietary pattern consists mainly of vegetables, fruit, whole grains, legumes, nuts, olive oil and fish. Red meat and processed products are rare; wine can moderately be part of meals.
This pattern has been studied for years in diabetic complications, particularly in kidney complications. A recent systematic review (2026) in insulin users shows that adherence to the Mediterranean pattern is associated with less severe kidney disease and slower progression of kidney damage. It appears to have a protective effect, especially because it can lower inflammation markers and places less stress on the kidneys.
Risks are limited, but people with severe kidney damage may need to be cautious with certain minerals (potassium, phosphorus) found in some Mediterranean foods — this requires guidance from the treating physician.
Protein-rich nutrition
ResearchediPositive results in clinical studies, not yet standard treatment
Protein-rich nutrition contains more meat, fish, dairy products, eggs and plant-based protein sources than usual. The goal is usually to maintain muscle strength.
In diabetes with complications, muscle loss plays a role in the disease process. Research suggests that older people with diabetes-related liver disorders who have low muscle strength carry a higher risk of death. A certain protein intake helps prevent muscle wasting. At the same time, protein intake is sometimes limited in severe kidney damage, because damaged kidneys can process fewer waste products. This requires individual tailoring.
The risk exists that excessive protein consumption further burdens the kidneys — which is precisely why this must be done carefully under supervision.
Fasting patterns (periodic fasting / intermittent fasting)
ExperimentaliOngoing in study setting, outcome still unknown
Periodic fasting means that your food intake is restricted at fixed times — for example, eating only between certain hours of the day, or eating very little for a few days per week.
A recent study (2026) on 'fasting-mimicking diet' in type 2 diabetics shows effects on heart function. Other research suggests that certain forms of fasting may have benefits for blood sugar control and inflammation. However, this research is still in an early stage, and fasting carries risks: blood sugar can drop unexpectedly, especially with medication; electrolytes can become unbalanced; and the kidneys can become additionally stressed.
Fasting with severe complications is only safe under close medical supervision.
Ketogenic diet
UnproveniNo scientific evidence that it works
A ketogenic diet severely restricts carbohydrates and increases fat and protein, causing the body to enter ketosis (burning fat instead of sugar).
For diabetic complications, there is no evidence from research to support it. Ketogenic eating is sometimes studied in research settings for blood sugar control, but far from all studies are positive. Moreover, it carries risks: kidneys can become additionally stressed; lipid profile can become unfavorable; and the composition can cause complete deficiencies.
For diabetes with severe kidney damage or heart complications, this diet is not recommended without very strict medical review.
Nutrition with emphasis on anti-inflammatory substances
ResearchediPositive results in clinical studies, not yet standard treatment
This pattern emphasizes vegetables, berries, fatty fish (omega-3), tea, spices (turmeric, ginger) and other foods with anti-inflammatory properties.
Research from 2026 shows that inflammation plays a key role in diabetic kidney disease and heart complications. Inflammation markers are elevated in many people with diabetes-related damage. A dietary pattern that keeps these markers lower could theoretically have a protective effect. This aligns with the Mediterranean pattern, but specifically emphasizes anti-inflammatory components.
This pattern is not discouraged; caution applies only to certain herbal supplements that may interfere with medication.
Nutrition with low glycemic index
ResearchediPositive results in clinical studies, not yet standard treatment
This eating pattern chooses foods that raise blood sugar gradually (not quickly), such as whole grains, certain fruits and vegetables, instead of white bread, refined sugar and fast-acting carbohydrates.
More stable blood sugar reduces peaks and is beneficial for the heart and kidneys. In diabetes with complications, this is standard practice. It does not reverse existing damage, but can slow further deterioration.
Risks are minimal; adjustment of medication (insulin, blood pressure) may be necessary because the effect becomes more predictable.
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Nutrition as part of care
Dietary choices in diabetes with complications are strongly tailored to the individual situation: which organs are damaged, which medication is used, what is body weight, how do the kidneys and heart function. What is beneficial for one person may be unsuitable for another.
A specialized dietitian familiar with your diabetes type and complications can work with your doctor to determine which pattern fits best. Starting diets independently without this consultation can carry risks, especially if you use medication for blood sugar, blood pressure or kidney function.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._