Two of the biggest weight loss conversations in South Africa right now involve very different approaches: GLP-1 receptor agonist injections like Ozempic and Wegovy (semaglutide), and the classic high-fat, low-carb Banting diet popularised locally by Professor Tim Noakes. One requires a prescription and a monthly budget that rivals a car payment. The other needs only a trip to Woolworths and some discipline at the braai.
So which works better? The honest answer is: it depends. This article breaks down both options across cost, effectiveness, sustainability, side effects, and who each approach actually suits.
Important: Neither GLP-1 medications nor any diet plan should be started without consulting a doctor or registered dietitian. This article is for information only and does not constitute medical advice.
What Are GLP-1 Receptor Agonists?
GLP-1 (glucagon-like peptide-1) receptor agonists are a class of medications originally developed for type 2 diabetes management. They mimic a natural gut hormone that signals fullness, slows gastric emptying, reduces appetite, and regulates blood sugar. The result: most people eat significantly less, often without trying.
In South Africa, the key GLP-1 medications available for weight loss include:
- Ozempic (semaglutide, weekly injection): Licensed for type 2 diabetes but widely prescribed off-label for obesity
- Wegovy (semaglutide, higher dose, weekly injection): Specifically licensed for chronic weight management; supply has been inconsistent in SA
- Saxenda (liraglutide, daily injection): Older GLP-1, licensed for obesity, lower efficacy than semaglutide
- Generic semaglutide compounded options: Available from some SA compounding pharmacies at lower cost; quality and regulation vary
What Is the Banting Diet?
The Banting diet is a very low carbohydrate, high fat (LCHF) eating plan. Named after Victorian Englishman William Banting but brought to mainstream South Africa by Professor Tim Noakes and the Real Meal Revolution, it involves:
- Reducing carbohydrates to under 25–50 g per day (strict Banting) or under 100 g (moderate)
- Replacing carb calories with healthy fats: olive oil, butter, avocado, nuts, full-fat dairy
- Moderate protein: meat, fish, eggs, chicken — all naturally part of SA braai culture
- Eliminating sugar, bread, pap, rice, pasta, potatoes, fruit juices
- The metabolic goal is ketosis: the body burns fat for fuel in the absence of carbohydrates
Head-to-Head Comparison
Effectiveness for Weight Loss
GLP-1 injections: Clinical trial data is compelling. The STEP trials for semaglutide (Wegovy dose) showed average weight loss of 15–17% of body weight over 68 weeks — roughly 15 kg for a 90 kg person. This is far beyond what most dietary interventions achieve in trials. The mechanism is largely appetite suppression: people simply stop wanting to eat large amounts.
Banting diet: Research on very low carb diets shows strong initial results — often 5–10% of body weight in the first 3–6 months, partly from water loss as glycogen stores deplete. Long-term (12–24 months) results are comparable to other dietary patterns when adherence is matched. The key phrase is "when adherence is matched" — strict Banting is not easy to sustain in a South African social context (braais, family meals, restaurant eating).
Winner on raw efficacy: GLP-1 injections, based on clinical trial evidence. But efficacy assumes you can afford them and tolerate them.
Cost in South Africa
This is where the comparison becomes very South Africa-specific.
- Ozempic (0.5 mg or 1 mg weekly): Approximately R2 500–R3 500 per month at retail pharmacy pricing (2024–2025 estimates; supply affects price)
- Wegovy (2.4 mg weekly): Where available, R5 000–R7 000+ per month; severely supply-constrained in SA
- Compounded semaglutide: R1 200–R2 000 per month at some SA compounding pharmacies; but product quality, sterility and dosage accuracy are not guaranteed under the same standards as registered medicines
- Banting diet: Eating Banting can actually be economical in SA — eggs, tinned fish, chicken, biltong, vegetables, and full-fat dairy are all accessible. A dedicated Banting household might spend an extra R500–R1 500 per month compared to a standard SA diet, mainly on quality fats and meat.
Winner on cost: Banting, by a wide margin. Most medical aids do not cover GLP-1 medications for weight loss (only for type 2 diabetes with specific criteria), making it an out-of-pocket expense for the majority of South Africans.
Side Effects and Safety
GLP-1 injections:
- Nausea, vomiting, and diarrhoea are the most common, especially in the first 4–8 weeks of dose escalation
- Constipation, fatigue, and reflux also occur
- Rare but serious: pancreatitis, gallstones (cholelithiasis), and potential thyroid tumour risk (seen in animal studies; not confirmed in humans at standard doses)
- Muscle loss: some research suggests significant fat-free mass (muscle) loss alongside fat loss if adequate protein intake and resistance exercise are not maintained
- Rebound weight gain: the majority of weight lost on GLP-1 medications is regained within 1–2 years of stopping the drug
- Fake products: South Africa has a documented problem with counterfeit Ozempic and unregulated compounded GLP-1 products. SAHPRA has issued warnings. See our guide to fake Ozempic in SA.
Banting diet:
- Keto flu in the first 1–2 weeks: headaches, fatigue, irritability, brain fog as the body adapts to fat burning
- Electrolyte imbalances (low sodium, potassium, magnesium) if fluid and mineral intake are not managed
- Constipation if vegetable intake is insufficient
- Elevated LDL cholesterol in some individuals (though HDL typically rises and triglycerides fall)
- Not suitable for people with familial hypercholesterolaemia or certain liver conditions without medical supervision
- Long-term safety data beyond 2 years is limited, though no major harms have been demonstrated in healthy adults
Winner on safety profile: Banting has a longer real-world track record and no prescription requirement, but both carry risks that warrant medical guidance. GLP-1 medications have more serious potential side effects and require a doctor's oversight.
Sustainability and Lifestyle Fit
GLP-1 injections: Patients often describe dramatically reduced food cravings and appetite, which makes eating less feel effortless. The challenge: this only lasts as long as you are taking the medication. When you stop (due to cost, side effects, or choice), hunger returns and weight typically comes back unless a healthy dietary pattern has been established during the treatment period.
Banting diet: South Africa is uniquely suited to Banting. The local food culture — braai, biltong, droewors, boerewors, grilled meat, avocados, eggs — is naturally Banting-compatible. The hard part is eliminating pap, bread, and sugar from a diet where these are social staples. Long-term adherence rates for strict Banting are lower than for moderate low-carb approaches.
Winner on sustainability: Banting, for those who can adapt to it. But "sustainable" is personal — some people find the appetite suppression of GLP-1s gives them time to build better eating habits that they maintain after stopping.
Speed of Results
GLP-1 injections: Most patients see significant weight loss within 4–12 weeks of reaching therapeutic dose. The full effect builds over 3–6 months.
Banting diet: The first 2 weeks often produce dramatic scale results (3–5 kg) due to water and glycogen loss. After this initial drop, fat loss typically averages 0.5–1 kg per week on strict Banting.
Winner on speed: GLP-1 injections, particularly at higher doses.
Can You Combine GLP-1 and Banting?
Yes — and there is a case to be made for it. Some South African patients on GLP-1 medications choose to follow a low-carb or Banting eating pattern alongside the medication. The rationale:
- GLP-1 medications reduce appetite; Banting reduces carbohydrate-driven insulin spikes. The two mechanisms complement each other.
- When GLP-1 medication is eventually discontinued, having a Banting framework in place gives a dietary structure to fall back on rather than returning to old habits.
- High-protein, moderate-fat eating on Banting may help preserve lean muscle mass, which is a concern with rapid GLP-1-driven weight loss.
If you are combining both, medical supervision is particularly important — blood sugar, lipid levels, and nutrient status all need monitoring.
Who Should Choose GLP-1 Injections?
- Adults with a BMI above 30, or above 27 with weight-related comorbidities (type 2 diabetes, hypertension, sleep apnoea)
- People who have tried multiple dietary approaches without sustained success
- Those who can afford R2 500–R4 000 per month without financial strain, or whose medical aid covers it for diabetes management
- Individuals who are willing to commit to a long-term treatment strategy and understand that stopping the medication typically reverses results
Who Should Choose Banting?
- Adults with insulin resistance, pre-diabetes, or type 2 diabetes who want dietary management without medication (under medical supervision)
- People who respond well to clear dietary rules and enjoy meat, fat, and vegetables
- Budget-conscious individuals for whom ongoing medication costs are not feasible
- Those who want a lifestyle change rather than a drug-dependent solution
- People already eating a South African diet who need a structure that respects braai culture
What the Evidence Says
It is important to be honest about the evidence base:
- GLP-1 medications (particularly semaglutide at Wegovy doses) have the strongest randomised controlled trial evidence of any weight loss intervention ever studied, except bariatric surgery.
- Very low carbohydrate diets have strong evidence for short-term weight loss and blood sugar improvement, but long-term adherence is a consistent challenge across studies.
- No dietary pattern has proven superior to all others for long-term weight loss when adherence is equal. The best diet is the one you can actually stick to.
- The combination of any evidence-based diet with behavioural support (regular check-ins with a dietitian or doctor) consistently outperforms either diet or medication alone.
The Bottom Line
GLP-1 injections win on raw weight loss efficacy but come with significant cost, side effects, and a rebound problem when stopped. The Banting diet wins on cost, sustainability for many South Africans, and long-term health habit formation. Neither is a magic solution. Both work better alongside regular movement, adequate sleep, stress management, and professional support.
If you can afford GLP-1 medications and your doctor recommends them for your health situation, they are a powerful tool. If cost or access is a barrier — which it is for most South Africans — a well-structured low-carb or Banting approach, followed consistently, produces meaningful and lasting results.
Always consult a doctor before starting GLP-1 medications. Never purchase semaglutide or other GLP-1 medications without a valid prescription from a registered South African healthcare provider. Fake and unregulated products are a documented risk. Visit SAHPRA.org.za for regulatory guidance.