How high blood sugar damages the kidneys
Over years, persistently high glucose damages the glomeruli — the kidney's tiny filtering units. The damage starts with thickening of the basement membrane, then scarring (glomerulosclerosis). The kidneys begin to leak albumin into the urine. At the same time, diabetes damages blood vessels throughout the body, including those supplying the kidneys, compounding the injury.
Screening — why it must be annual
All adults with diabetes should have annual urine ACR and serum eGFR tests. The urine ACR detects protein leak before eGFR drops. If ACR is elevated (≥3 mg/mmol) but eGFR is normal (≥60), you have early diabetic kidney disease — the window when intervention works best. If both are abnormal, specialist referral to a nephrologist is indicated.
Blood sugar control — HbA1c targets
Individualised HbA1c targets are recommended. NICE suggests 48 mmol/mol (6.5%) for many adults with type 2 diabetes, or up to 58 mmol/mol (7.5%) if hypoglycaemia is a risk. Better glucose control slows albuminuria onset and progression. Continuous glucose monitors (CGMs) can help fine-tune control without frequent hypos.
Kidney Vitality is a daily multivitamin developed by a UK Consultant Nephrologist using renal nutrition principles. It contains no added potassium, magnesium, phosphorus or iron, and no herbal blends. See the formulation.
Blood pressure — the most powerful modifiable risk
In diabetic kidney disease, blood pressure control is as important as glucose control. Target under 130/80 mmHg in clinic if tolerated. ACE inhibitors (e.g. ramipril, lisinopril) or ARBs (e.g. losartan, valsartan) are first-line — they reduce protein leak independent of their blood pressure effect. Monitor potassium and eGFR 1–2 weeks after starting or increasing dose.
SGLT2 inhibitors — a game-changer
Sodium-glucose co-transporter 2 (SGLT2) inhibitors — dapagliflozin, empagliflozin, canagliflozin — reduce the risk of kidney failure, cardiovascular death and heart failure in people with diabetes and CKD. NICE recommends them for adults with type 2 diabetes and CKD (eGFR ≥20) regardless of HbA1c. They lower blood pressure modestly and cause some weight loss. Genital infections are the main side effect to watch for.
Diet and lifestyle in diabetic kidney disease
Salt restriction (under 5–6 g/day) helps blood pressure and proteinuria. Moderate protein intake — neither very high nor very low. Maintain a healthy weight. Stop smoking — it accelerates kidney and cardiovascular damage. Regular physical activity (150 minutes/week moderate intensity) improves insulin sensitivity and blood pressure. A renal dietitian can tailor advice if eGFR drops below 30 or if potassium/ phosphate become issues.
