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CHOLESTEROL SERIES · ARTICLE 10 OF 12
The metabolic triad
High BP, diabetes and cholesterol.
High BP, diabetes and high cholesterol travel together. About two out of every three South African diabetics also have high BP. About half also have raised cholesterol. The three together — the “metabolic triad” — drive most of the heart attacks, strokes, kidney failures and amputations that shorten lives in this country.
If you have any one of them, the chances that you have or will develop one of the others are high. If you have two, the third is usually waiting. This article is about why they travel together, how they amplify each other’s damage, what the integrated targets look like — and the single set of habits that helps all three at once.
A bridge between three Phila Today series
This article ties together the Diabetes Series, the High Blood Pressure Series, and this Cholesterol Series. If you have any of the three conditions, the other two series are companion reading. We will cross-reference both throughout.
Why these three travel together
For decades, high BP, diabetes and cholesterol were treated as separate conditions that just happened to co-exist. The research of the last 30 years has shown they share a deep root cause called insulin resistance.
What insulin resistance actually does
When cells of the body stop responding properly to insulin, the body produces more of it to compensate. High levels of insulin do several things at once:
• Tell the kidneys to hold on to salt — raising BP.
• Drive the liver to make more triglycerides and small, dense LDL particles — worsening cholesterol.
• Cause weight gain, especially around the middle — feeding back into more insulin resistance.
• Eventually exhaust the pancreas — leading to Type 2 diabetes.
• Stiffen blood vessel walls — accelerating BP, cholesterol and diabetic damage all at the same time.
So before any of the three conditions is diagnosable on a test, the engine driving all of them is already running. This is why so many people develop them in sequence over a few years — and why making changes for one almost always helps the others.
The shared risk factors
All three conditions share an almost identical risk profile:
• Age over 40
• Family history of any of the three
• Black, Indian, Afrikaner or Ashkenazi Jewish South African ancestry
• Carrying extra weight, especially around the middle
• A diet high in salt, sugar, refined carbs and saturated fat
• Sedentary lifestyle
• Smoking
• Long-term stress and poor sleep
If you have any three of these, the chance that you have or will develop all three conditions is high. If you have five or more, it’s almost certain.
How they amplify each other’s damage
High BP alone damages arteries. Diabetes alone damages arteries. High cholesterol alone damages arteries. The three together damage arteries faster, more severely, and in more places than any one alone. The combined risk isn’t 1+1+1=3 — it’s closer to 1+1+1=8.
The heart
People with all three conditions have 5 – 8 times the heart attack risk of people with none. Plaque builds in coronary arteries from cholesterol, the artery walls are stiffened by high BP, and diabetic small-vessel damage compounds both. Heart failure follows behind, particularly in people whose diabetes hasn't been well controlled.
The good news: Treating all three to target — LDL under 1.8, BP under 130/80, HbA1c under 7% — cuts that 5 – 8× risk back close to baseline within 5 – 10 years.
The brain
Stroke risk is multiplied by each condition. Carotid plaque from cholesterol, narrowed arteries from BP, sticky blood and inflammation from diabetes — all three converge in the brain's blood supply. Vascular dementia in later life is also much more common in patients with all three.
The good news: Each of the three conditions, treated, cuts stroke risk by 20 – 30%. Together, the combined treatment effect is dramatic.
The kidneys
Diabetes is the single biggest cause of chronic kidney disease in South Africa. High BP is the second biggest. Cholesterol adds to the damage. People with all three develop kidney failure years earlier than those with one alone.
The good news: ACE inhibitors and ARBs (BP article 9) protect kidneys in diabetics. Statins protect kidney blood vessels. Good blood sugar control slows progression. With aggressive treatment of all three, most patients never reach dialysis.
The legs and feet
Peripheral artery disease (from cholesterol) plus diabetic nerve damage (neuropathy) plus high-BP-driven artery damage is the combination that leads to most diabetic foot amputations in South Africa.
The good news: Daily foot checks, well-controlled BP, well-controlled blood sugar, statins and stopping smoking together prevent most foot complications.
The eyes
Diabetic retinopathy, hypertensive retinopathy and cholesterol-related retinal artery plaques can all be present at once in someone with the triad. The risk of vision loss is significantly higher than with any single condition.
The good news: Annual eye exams catch problems early, and tight control of all three conditions slows or stops progression.
The integrated targets
When you have all three conditions, every target is tighter than for any one alone. The reasoning is that the combined damage is bigger, so the protection from tight control is bigger too.
Number Target with the triad Blood pressure Below 130 / 80 mmHg HbA1c (3-month blood sugar) Below 7%, below 6.5% if achievable without hypos LDL cholesterol Below 1.8 mmol/L, lower if previous heart attack Triglycerides Below 1.7 mmol/L Waist circumference Below 94 cm men / 80 cm women Annual urine protein Negative Annual eye check Yes Annual foot exam Yes
These targets aren’t arbitrary. Each one is the level at which large trials have shown the biggest reduction in heart attack, stroke, kidney failure and amputation in patients with multiple conditions.
The single habit set that helps all three
The remarkable thing about the metabolic triad is that almost everything that lowers BP also lowers blood sugar and lowers cholesterol. The food list from this series article 5 overlaps with the BP article 5 list and the Diabetes Series article 3 list. The walking plan is the same plan. The salt-saturated-fat-sugar avoidance overlaps almost completely.
If you have the triad, you don’t follow three different diets, three different exercise plans, three different lifestyles. You follow one:
• Eat from the cholesterol food list: oats, beans, pilchards, nuts, avocado, sunflower oil, greens, tomato, sweet potato, apples. Almost identical to the BP and diabetes lists.
• Cut salt, sugar and saturated fat equally. Bread, polony, stock cubes, sugary drinks, fatty meats, fried takeaways — these damage all three conditions.
• Walk 30 minutes briskly, 5 days a week. Lowers BP by 5 – 8 mmHg, HbA1c by 0.5 – 1%, and LDL by 3 – 5%. Almost no other single intervention does all three.
• Sleep 7 – 8 hours, treat sleep apnoea if present. All three respond.
• Quit smoking. Limit alcohol. Manage stress.
• Take all your medications every day, for life.
Medication when you have all three
Most South Africans with the triad end up on a regimen that looks something like this:
Tablet What it does SA availability ACE inhibitor or ARB Lowers BP, protects kidneys in diabetics Free at public clinics Calcium channel blocker (amlodipine) Lowers BP further Free at public clinics Metformin Lowers blood sugar, helps with weight Free at public clinics Statin (simvastatin or atorvastatin) Lowers LDL by 30 – 50% Free at public clinics Low-dose aspirin (in some) Reduces clotting risk after heart attack Free at public clinics
It looks like a lot. But each tablet is doing a specific protective job, and many can be taken together as combination pills. The public-sector chronic care track is built exactly for this combination.
The single-pill advantage
South African public clinics increasingly use fixed-dose combination tablets — for example, an ACE inhibitor plus a calcium channel blocker in one pill, or aspirin plus simvastatin in one pill. People who take fewer separate tablets are far more likely to take them reliably. If you are juggling three or four tablets a day, ask whether your combination is available as a single pill.
The newer drugs that help across the triad
Two newer classes of diabetes drugs help all three conditions at once and are worth knowing about:
• SGLT2 inhibitors (empagliflozin, dapagliflozin, canagliflozin) — lower blood sugar, lower BP by 4 – 5 mmHg, slow kidney disease progression, and reduce heart failure. Not yet on the public-sector list for general use but available privately and on some medical aid formularies.
• GLP-1 receptor agonists (semaglutide, liraglutide) — lower blood sugar, lower BP, modestly lower LDL, and produce significant weight loss. Available privately; expensive.
If you have all three conditions and access to private care, ask your doctor whether either of these would be appropriate.
What the integrated clinic visit looks like
In a well-run public chronic-care clinic, a patient with all three conditions is in a track that bundles everything into one visit, usually every 1 – 3 months. A typical visit includes:
• BP, weight, sometimes waist measurement
• Finger-prick blood sugar, plus HbA1c every 3 – 6 months
• Lipid panel annually, more often after treatment changes
• Urine dipstick for protein
• Foot exam annually (more often if at risk)
• Medication review and adherence check
• Monthly prescription refill
Once a year you should also have a kidney function blood test (creatinine and eGFR), a cholesterol panel if it hasn’t already been done, and an eye check from an optometrist or ophthalmologist.
What to ask your clinic
If you have all three conditions, reasonable questions to bring to a visit:
• “What were my last BP, HbA1c and LDL readings? Are they on target?”
• “When was my last kidney function test? My urine dipstick?”
• “When was my last eye check?”
• “Am I on an ACE inhibitor or ARB? A statin? If not, why not?”
• “Can any of my tablets be combined into a single pill?”
• “Should I be considered for an SGLT2 inhibitor?”
• “What’s my 10-year cardiovascular risk percentage?”
• “When should I come back?”
The bigger picture
Having all three conditions is not the bad luck it can feel like. They travel together because they share a root cause; they damage organs in the same places because they target the same kinds of blood vessels; and — most importantly — they respond to the same kinds of treatment. Almost every single thing you do to manage one will help the others.
Patients who treat the triad well in their forties and fifties end up, on average, with as much healthy time ahead of them as people who never had any of the three. The triad does not have to be a slow road to amputation, dialysis, blindness, stroke and heart failure. With careful, consistent, ordinary care, it can be a manageable, long-lived background condition.
The next article in the series covers a specific kind of high cholesterol that doesn’t always fit the triad pattern — familial hypercholesterolaemia, which is unusually common in South Africa and which most affected people don’t know they have.
Where to get more help
Diabetes South Africa — diabetessa.org.za · 011 792 9888.
Heart and Stroke Foundation South Africa — heartfoundation.co.za · 021 422 1586.
Your public clinic chronic-care team — designed exactly for people with multiple conditions.
Phila Today Diabetes Series and High Blood Pressure Series — companion reading.
Phila Today Cholesterol Series — next: familial hypercholesterolaemia — when high cholesterol runs in the family.
Phila Today · Article 10 of 12 in the Cholesterol Series