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HIGH BLOOD PRESSURE SERIES · ARTICLE 5 OF 12
The 10 most affordable South African foods that lower blood pressure
Foods to eat — what they do, how much, and how to use them.
Food is not a substitute for blood pressure medication. But it is one of the most powerful additions to it. The right pattern of eating can bring systolic BP down by 8 – 14 mmHg — which is in the same league as a small-dose tablet, and free.
In this article we cover the ten foods that, in a South African kitchen, give you the most BP-lowering benefit per rand spent. They are not exotic, expensive or fashionable. They are pap, samp, mince, vetkoek country — the basics, used well.
How food lowers blood pressure
Four ingredients in food do most of the work: potassium (which counteracts salt), magnesium (which relaxes blood vessels), nitrate (which the body turns into a vessel-widening molecule called nitric oxide), and fibre (which improves blood vessel function over time).
Every food in this article delivers two or more of those four. Together, they shift the body’s whole pressure system in the right direction.
The list, before we explain it
1. Beans (sugar beans, lentils, samp-and-beans)
2. Beetroot
3. Bananas
4. Oats
5. Sweet potato
6. Spinach / morogo / wild greens
7. Garlic
8. Low-fat amasi (and other unsweetened dairy)
9. Tinned pilchards or sardines
10. Unsalted nuts and peanuts
Now in order of cheapest per serving, starting with the food that gives you the most BP benefit for the smallest spend.
1. Beans — sugar beans, lentils, samp-and-beans
ABOUT R3 – R5 PER SERVING
Loaded with potassium, magnesium and fibre. Possibly the highest BP-lowering value per rand in the South African diet.
A cup of cooked sugar beans gives you about 700 mg of potassium and 60 mg of magnesium. That is roughly a quarter of what you need in a day, from a R3 spoonful. Lentils are similar but cook faster. Samp-and-beans, the traditional combination, is one of the best BP-friendly meals you can put together.
Research shows that adding one cup of beans, lentils or chickpeas to your daily diet brings systolic BP down by about 5 mmHg in three months. Almost no other single food can claim that.
Use it: Sugar beans with mince. Samp-and-beans (umngqusho). Lentil curry. Three-bean salad. Add half a cup of cooked beans to any stew. Tinned beans (drained and rinsed to lose the salt) work fine when you don’t have time to soak dried ones.
2. Oats — instant or rolled
ABOUT R3 – R5 PER SERVING
High in beta-glucan, a particular kind of fibre that lowers both cholesterol and blood pressure. Cheap, filling, and reliable.
Half a cup of dry oats delivers about 2 grams of beta-glucan — the amount shown in trials to bring systolic BP down by 2 – 4 mmHg over six weeks. Eating oats five mornings a week is one of the simplest BP changes you can make.
Important: skip the sugary, flavoured sachets. They have added sugar and almost no extra fibre. Plain instant oats, plain rolled oats, plain oat bran — these are the BP foods. Add fruit, milk or amasi for flavour.
Use it: Plain oats with milk and banana. Overnight oats with amasi. Oat porridge with peanut butter. Add half a cup of oats to mince or to a meatball mix instead of breadcrumbs.
3. Bananas
ABOUT R2 – R4 PER BANANA
Potassium in a portable, year-round, no-cook form. One of the easiest daily wins.
A medium banana has about 420 mg of potassium — almost 10% of what you need in a day. Two bananas a day is a small habit with a measurable effect on BP, especially in people who eat a lot of salt.
Bananas are available everywhere, last on the counter for a week, and cost less than almost any other fresh food in South Africa. They are also the easiest food to add to a child’s lunchbox or a worker’s lunch tin.
Use it: One banana with breakfast. One banana in the afternoon as a snack. Sliced banana on toast with peanut butter. Banana, milk and oats blended into a smoothie. Freeze ripe bananas for “ice cream” — blend with a splash of milk and a teaspoon of peanut butter.
4. Beetroot
ABOUT R3 – R6 PER SERVING
The single most powerful food on this list for short-term BP reduction. Loaded with dietary nitrate, which the body turns into nitric oxide — a chemical that relaxes blood vessels.
One medium beetroot (roughly the size of a tennis ball), eaten raw, cooked, juiced or pickled, can bring systolic BP down by 5 – 10 mmHg within four hours. The effect lasts about 24 hours and stacks if you eat beetroot daily.
Buy them fresh and unpickled when possible — pickled beetroot in vinegar still works but the high-salt pickled kind cancels out some of the benefit.
Use it: Grated raw beetroot in a salad with carrot. Roasted beetroot as a side dish. Beetroot in a stew (it goes purple but tastes wonderful). Beetroot juice (blend a small beetroot with an apple and a glass of water). Boiled, sliced and eaten cold with bread and butter.
5. Spinach, morogo, and other wild greens
ABOUT R5 – R10 PER SERVING
Triple-hitter: potassium, magnesium and nitrate. Traditional South African greens (morogo, imifino, marog) score even higher than supermarket spinach.
A cup of cooked spinach has about 850 mg of potassium, 150 mg of magnesium, and a good dose of nitrate. Cooked spinach is more concentrated than raw — a big bag of raw leaves cooks down to about a cup.
Wild greens that grow naturally across most of South Africa — morogo (Amaranthus), imifino, marog — have similar or higher nutrients than spinach and often cost nothing if you can pick them yourself or buy from a roadside vendor.
Use it: Pap and morogo with onion. Creamed spinach (low fat). Spinach with garlic and a squeeze of lemon. Add a handful to any stew in the last 5 minutes of cooking. Build a curry around spinach, lentils and tinned tomato.
6. Sweet potato
ABOUT R4 – R8 PER SERVING
More potassium than a banana, and a slower release of sugar than ordinary potato. Good for BP and good for blood sugar.
A medium baked sweet potato delivers about 540 mg of potassium and a decent amount of fibre. It also has a lower glycaemic index than white potato or pap — which means smaller blood sugar spikes, less insulin response, and over time, lower BP.
People with both diabetes and high BP get particular benefit from swapping white starches for sweet potato two or three times a week.
Use it: Baked sweet potato with a small amount of butter and herbs. Sweet potato wedges in the oven (no need for oil if you bake them on baking paper). Sweet potato mash. Sweet potato curry. Sliced sweet potato in a chakalaka.
7. Tinned pilchards or sardines
ABOUT R8 – R15 PER TIN (2 – 3 SERVINGS)
Omega-3 fats, which lower BP through a different mechanism to potassium — they improve blood vessel flexibility. Also rich in calcium (bones included).
A serving of tinned pilchards or sardines a few times a week delivers a meaningful dose of EPA and DHA — the active omega-3 fats. Trials show this brings systolic BP down by 2 – 4 mmHg.
The tomato-sauce version is fine for BP. Choose unsalted or low-salt brands where you can, and avoid the smoked or flavoured options, which tend to have a lot more salt.
Use it: Pilchards on toast. Pilchards mixed into pasta with onion and tomato. Sardine and onion sandwich. Mashed pilchards as a sandwich filling. Pilchard fishcakes (mix with mashed sweet potato and oats instead of bread).
8. Low-fat amasi (and other unsweetened dairy)
ABOUT R6 – R10 PER SERVING
Calcium and potassium and a small amount of protein. Two to three servings of low-fat dairy a day is part of the DASH diet, which lowers BP by an average of 8 – 11 mmHg.
Amasi (sour milk, maas) is the traditional South African low-fat dairy. A cup gives you about 350 mg of calcium and 380 mg of potassium. Plain yogurt and low-fat milk work just as well.
Avoid sweetened drinking yogurts and flavoured maas — they pack in sugar that undoes a lot of the benefit. Plain, unsweetened, low-fat is the rule.
Use it: Amasi with mealie meal porridge (traditional and excellent). Amasi with bran or oats. Amasi as a marinade for chicken. Plain yogurt as a substitute for cream or mayonnaise in salads.
9. Garlic
ABOUT R1 – R2 PER SERVING
Garlic contains a compound called allicin that has a small but measurable BP-lowering effect.
Two to four cloves of fresh garlic a day, used in cooking or eaten raw, brings systolic BP down by about 3 – 5 mmHg in people with high BP. The effect is smaller than beetroot or beans, but garlic is so cheap and so easy to add to almost every dish that it earns its place on the list.
Garlic supplements work too, but at higher cost. The food version is just as good for most people.
Use it: Crush two cloves into any stew, curry, soup or stir-fry. Roast a whole bulb and spread it on bread (sweet and mild). Garlic and olive oil on pasta. Crushed garlic in plain yogurt as a sauce. Raw garlic on a slice of bread with tomato — Mediterranean breakfast.
10. Unsalted nuts and peanuts
ABOUT R6 – R12 PER HANDFUL
Magnesium, healthy fats, and a feeling of fullness that helps with weight control. Especially good if you struggle with snacking on chips or biscuits.
A small handful (about 30 grams) of unsalted nuts or peanuts a day delivers a good dose of magnesium and brings systolic BP down by about 2 – 5 mmHg. Almonds, peanuts, walnuts, cashews — all work. Choose unsalted; salted nuts undo most of the benefit.
Peanuts are by far the cheapest option in South Africa and work as well as more expensive nuts. A bag from a corner shop, in modest amounts daily, is one of the best small swaps for biscuits, crisps or chocolates.
Use it: A handful as a mid-morning or afternoon snack. Add to oats or yogurt. Chopped on top of salad. Peanut butter (unsweetened) on banana, on toast, in oats. Stir-fry with peanuts and chicken.
How to actually do this
Eating “more of these and less salt” sounds simple, and over time it is, but the first month is the hardest. Here is what we suggest.
Week 1: Pick three
Don’t try to add ten new foods at once. Pick three from the list — ideally one carbohydrate (oats, sweet potato or beans), one fruit or vegetable (bananas, beetroot or morogo), and one protein or dairy (amasi, pilchards or peanuts). Eat at least one of each, every day, for the first week.
Week 2 – 4: Build on the wins
Add a fourth, then a fifth, then a sixth, one a week. By the end of the month, you should be eating at least 5 – 6 of these foods most days, with the rest of your meals built around them.
Pair each addition with a subtraction
For each new BP-friendly food you add, try to remove or reduce one BP-unfriendly habit at the same time. We will cover the full salt-and-avoidance list in the next article, but a starting point:
• Cut bread by half a slice per meal — the biggest source of hidden salt for most South Africans.
• Stop adding stock cubes to stews. Use garlic, onion and herbs instead.
• Skip the polony, viennas and processed meats — even once a week makes a difference.
• Don’t drink your juice — eat the fruit instead. Juice is sugar without the fibre.
How much of a difference can food really make?
The full DASH eating pattern — built around the foods in this article — has been shown in large trials to lower systolic BP by 8 – 14 mmHg, and diastolic by 4 – 8 mmHg. That is in the same range as a starting-dose BP tablet, with no side effects, no clinic visits, and no monthly bill.
For someone in Stage 1 (130 – 139 / 80 – 89), this is often enough to bring BP back into the normal range without any medication. For someone in Stage 2, this is enough to need fewer or smaller doses of tablets — and to get better results from the tablets you do take.
What about salt?
Salt is its own subject and the next article in the series is entirely about it. The short version: the average South African eats about twice as much salt as the body was built for, and most of it is hidden in places you would not expect — bread, polony, stock cubes, takeaways, instant noodles.
Eating more potassium (everything on this list) and less salt (the next article) is the most powerful single pair of changes you can make for your blood pressure.
The bigger picture
None of the foods in this list are a miracle. None of them lower BP by 30 mmHg overnight. What they do, eaten consistently and together, is shift the whole pressure system in the right direction — sometimes enough to make tablets unnecessary, more often enough to make tablets work better at smaller doses with fewer side effects.
You do not need a special diet, fancy shopping, or a nutritionist. You need pap, samp, beans, morogo, bananas, oats, sweet potato, amasi, pilchards, garlic, peanuts. The kind of food South African families have been eating for generations — just less of the salty packaged stuff and more of the rest.
The next article in the series is the other half of this story: the salt problem. How much is too much, how to read a food label properly, and where the hidden salt actually lives in everyday South African food.
Where to get more help
Heart and Stroke Foundation South Africa — heartfoundation.co.za · 021 422 1586 — DASH-style recipes adapted for South African families.
The Association for Dietetics in South Africa (ADSA) — adsa.org.za — find a registered dietitian, including free or low-cost options.
Phila Today Eat tab — many of the recipes already use these ten ingredients.
Phila Today High Blood Pressure Series — next: the salt problem — foods to avoid and where it’s actually hiding.
Phila Today · Article 5 of 12 in the High Blood Pressure Series