Heart Health Across Conditions: Why Kidney Disease, Diabetes and Dementia All Raise Cardiovascular Risk

Chronic kidney disease, type 2 diabetes and dementia are usually discussed as separate conditions, affecting separate organs, tracked by separate specialists. But look closely at the research on any one of them and the heart keeps turning up. Declining kidney function raises the risk of heart failure and heart attack. Diabetes carries a lipid problem serious enough to affect the majority of patients. And vascular dementia — the second most common form of dementia after Alzheimer’s — is, at its root, a blood vessel disease.

Here’s how the evidence connects these three conditions back to the cardiovascular system — and why heart wellness deserves to be part of the conversation whenever any of the three comes up.

Kidney disease is a cardiovascular risk multiplier

The relationship between kidney function and cardiovascular events is one of the most consistent findings in nephrology research. A landmark study published in the New England Journal of Medicine tracked the age-standardised rate of cardiovascular events per 100 person-years across estimated GFR (eGFR) bands, and the pattern is stark: at an eGFR of 60 or above, the rate was 2.11 per 100 person-years. Once eGFR fell into the 30–44 range (Stage 3), the rate jumped to 11.29. By the time eGFR dropped below 15 (Stage 5), it reached 36.60 — more than 17 times the rate seen at normal kidney function.

A 2023 individual-participant meta-analysis published in JAMA, pooling data from over 700,000 participants, broke this down further by specific outcome. As eGFR declined from a reference point of 90 down toward 15, hazard ratios rose across the board — but not evenly. Peripheral artery disease (PAD) showed the steepest climb, with a hazard ratio around 4.1 at the lowest eGFR band, followed by cardiovascular mortality (~3.5), all-cause mortality (~3.3), heart failure (~2.8), and myocardial infarction (~2.5). PAD, heart failure and myocardial infarction are consistently flagged in the kidney literature as the major cardiovascular complications of CKD.

Heart failure in particular compounds the risk. Kaplan-Meier survival data following CKD patients for up to 48 months found that the probability of remaining free of heart failure hospitalisation dropped steadily as CKD stage advanced — from roughly 73% at Stage 1 down to well under 45% by Stage 3–4. And when heart failure and kidney disease occur together, survival outcomes worsen sharply: a 10-year survival analysis found that patients with CKD alone had roughly 55% survival at 10 years, but patients with both CKD and heart failure saw that fall to around 15–18%, regardless of whether diabetes was also present. Separately, a large observational study using a 5% Medicare sample found that the combination of anaemia, CKD and heart failure carried a relative risk of 2-year mortality of 6.07 compared with a healthy reference group — more than double the risk of CKD and heart failure alone (4.86).

Diabetes brings a lipid problem that hits almost everyone

Diabetes is one of the most established risk factors for cardiovascular disease, and a large part of that risk runs through cholesterol. Research on diabetic dyslipidaemia — the pattern of abnormal blood lipids that frequently accompanies diabetes — puts the prevalence at 70–80% of people with diabetes, with one China-based study finding dyslipidaemia prevalence rising in step with glycaemic status: 39.9% in people with normal glucose tolerance, 46.8% in prediabetes, and 59.3% in those with type 2 diabetes.

The relationship becomes even more pronounced once blood sugar is poorly controlled. One study found that 93.43% of patients with uncontrolled diabetes had some form of dyslipidaemia, compared with substantially lower rates — roughly 15–40% across the same lipid markers — in patients whose diabetes was well controlled. That gap between “controlled” and “uncontrolled” diabetic dyslipidaemia is one of the clearer illustrations in the research of why glycaemic control and cardiovascular risk move together rather than separately.

This lipid burden matters because dyslipidaemia is itself a direct driver of atherosclerosis and, downstream, of heart attack and stroke. It’s also compounded by obesity, which frequently accompanies type 2 diabetes: research modelling the relationship between BMI and dyslipidaemia risk found the odds ratio for dyslipidaemia climbing from roughly 0.3 at a BMI of 15 to around 2.4–2.8 at a BMI of 35 and above.

Dementia’s vascular half

Dementia is often thought of as a purely neurological condition, but roughly one in five cases is vascular dementia — a form caused directly by damage to the blood vessels supplying the brain. Research describes the mechanism as damage to the small blood vessels and the white matter fibres they supply, most often triggered by a blood clot breaking free and lodging in an artery feeding the brain. The well-established risk factor list for vascular dementia reads like a cardiovascular risk checklist: diabetes, hypertension, metabolic syndrome, stroke, and age.

The stroke connection is particularly well documented. A large population-based study (the Oxford Vascular Study) tracked dementia incidence following stroke and transient ischaemic attack (TIA) and found the risk scaled directly with stroke severity, measured by NIHSS score. Five years after the event, cumulative dementia incidence reached around 53% in patients who had suffered a severe stroke (NIHSS >10), compared with roughly 16% in those with a minor stroke and about 13% in those who had only a TIA. In other words, the more severe the vascular event, the more likely dementia followed — a relationship that only makes sense if the underlying vascular damage, not just an isolated “brain event,” is doing the driving.

Why the overlap matters

None of this means kidney disease, diabetes and dementia are the same condition wearing different masks. But the research is consistent in pointing to a shared underlying vulnerability: damage to blood vessels, whether in the kidney’s glomeruli, the arteries supplying the heart, or the small vessels feeding the brain. That shared vulnerability is exactly why cardiovascular risk factors — blood pressure, blood lipids, blood sugar, and vascular inflammation — show up again and again across research on all three conditions, and why general heart and circulatory wellness is relevant well beyond people who think of themselves as having “a heart problem.”

Everyday cardiovascular support

None of the research above is about treating kidney disease, diabetes or dementia — those are matters for a doctor’s ongoing care. But general, everyday cardiovascular wellness support is something anyone can reasonably build into a daily routine, alongside (never instead of) medical management of any diagnosed condition.

Naturext’s cardiovascular-support range takes a few different, complementary angles on this. Cardio CPS combines Astragalus membranaceus and hawthorn berry — two foundational herbs in Traditional Chinese Medicine long associated with heart and circulatory wellness — together with Panax ginseng, Coenzyme Q10, and selenium, for general everyday heart and circulatory wellness support. Nattokinase 2000 provides NSK-SD® nattokinase at 2000 FU per softgel, a natural enzyme from fermented soybeans studied for its role in supporting healthy circulation and normal blood flow. And NattoK2 Essence combines Vitamin K2 (as MK-7, from NattoMena™), Vitamin D2, and magnesium to support bone and cardiovascular wellness by helping direct calcium toward the bone matrix and away from arterial walls. All three are formulated as everyday wellness support — not as treatments for kidney disease, diabetes, dementia, or any diagnosed cardiovascular condition.

Frequently asked questions

Does having kidney disease or diabetes mean I’ll develop heart disease? No. These are risk relationships observed across large populations, not individual guarantees. They do mean that cardiovascular risk factors deserve extra attention if you have a diagnosed kidney, metabolic, or vascular condition — which is a conversation to have with your doctor.

Is vascular dementia the same as a stroke? Not exactly. Vascular dementia is caused by ongoing damage to the blood vessels supplying the brain, which can follow a single significant stroke, a series of smaller strokes, or gradual small-vessel disease without any single obvious “stroke event.” A stroke is one way vascular damage can occur; vascular dementia is one possible longer-term consequence.

Why does diabetes affect cholesterol levels specifically? Diabetes and lipid metabolism are closely linked biologically — insulin resistance affects how the body processes fats as well as sugar. That’s part of why dyslipidaemia is reported in the majority of people with type 2 diabetes, and why the two are so often managed together rather than as separate issues.

This article is for general information only and does not constitute medical advice. If you have a diagnosed kidney, cardiovascular, metabolic, or cognitive condition, consult your doctor before starting any new supplement.