Does Sugar Cause Acne?

You've heard it before, "put down the chocolate, it'll give you spots." But is there real science behind the sugar-acne connection, or is it just an old wives' tale? We break it down properly, because your skin deserves more than guesswork. 

Why Does Sugar Cause Acne?

Sugar doesn't cause acne directly, but it sets off a hormonal and inflammatory chain reaction that creates the ideal conditions for breakouts to form and worsen.

Here's the mechanism, step by step.

When you consume high-glycaemic foods; (white bread, sugary drinks, sweets, refined carbohydrates) your blood glucose spikes rapidly. Your pancreas responds by flooding the bloodstream with insulin to bring those levels back down. That insulin surge is where the skin trouble begins.

Insulin stimulates the production of androgens (male hormones present in all genders) which signal your sebaceous glands to produce more oil (sebum). Excess sebum mixes with dead skin cells inside pores, creating the blocked follicles that become blackheads, whiteheads, papules, and cysts. Simultaneously, insulin elevates a hormone called IGF-1 (insulin-like growth factor 1), which accelerates skin cell turnover in a way that clogs pores further and amplifies androgen activity, a compounding loop.

As Dr. Joshua Zeichner, Director of Cosmetic and Clinical Research in Dermatology at Mount Sinai Hospital, explains: "High-glycaemic foods cause a spike in insulin, which triggers a hormonal cascade that increases oil production in the skin. More oil means more food for acne-causing bacteria, and more bacteria means more breakouts."

Beyond the hormonal pathway, high sugar intake drives systemic inflammation; the underlying force behind the red, painful, cystic acne that topical products struggle to reach. Dr. Whitney Bowe, board-certified dermatologist and author of The Beauty of Dirty Skin, puts it plainly: "The food you eat can either fight inflammation or fuel it. And when it comes to acne, inflammation is the enemy."

There is also the process of glycation to consider: excess sugar molecules bind to collagen and elastin fibres, forming advanced glycation end-products (AGEs) that weaken skin structure, accelerate ageing, and impair the skin's ability to repair itself. As Dr. Nicholas Perricone, pioneer of the inflammation-ageing connection, has argued: "Sugar is pro-inflammatory, and inflammation is the engine of ageing. Every time you eat something that spikes your blood sugar, you are, in a very real sense, ageing your skin."

What Does Sugar Acne Look Like?

There is no single "sugar acne" lesion type, but dietary-driven breakouts tend to share recognisable patterns that distinguish them from other acne triggers.

Sugar-related acne typically presents as:

• Inflammatory papules and pustules — red, raised, often tender spots that appear in clusters rather than as isolated lesions. These are driven by the inflammatory cascade triggered by insulin spikes.
• Cystic acne — deep, painful nodules beneath the skin's surface that don't come to a head easily. Cystic acne is strongly associated with hormonal and inflammatory triggers, both of which are amplified by a high-glycaemic diet.
• Widespread congestion — a general dullness, bumpiness, or texture across the forehead, cheeks, and chin, caused by excess sebum production clogging multiple pores simultaneously.
• Breakouts that flare after dietary indulgences — many people notice a pattern: a weekend of high-sugar eating is followed by a cluster of new spots 2–3 days later, which aligns with the time it takes for the hormonal cascade to manifest visibly on the skin.

In South African skin, which tends toward deeper tones with a higher melanin density, inflammatory acne is particularly likely to leave behind post-inflammatory hyperpigmentation (PIH) the dark marks that persist long after the active lesion has healed.

For many patients, these marks are more distressing than the acne itself.

Dr. Tlaleng Mofokeng, South African physician and advocate for inclusive healthcare, has spoken directly to this: "For many of my patients, the acne itself is less distressing than the marks it leaves. Hyperpigmentation can persist for a year or more without targeted treatment, and it has a real impact on confidence and quality of life. We need to address both the acne and the aftermath."

Sugar Acne vs Hormonal Acne

Sugar acne and hormonal acne are closely related, in fact, they share many of the same underlying pathways. But there are meaningful differences in their patterns, triggers, and timing that can help you identify what's driving your breakouts.

Hormonal Acne

• Typically appears along the lower face: jawline, chin, and neck
• Flares predictably around the menstrual cycle, usually in the week before menstruation
• Often presents as deep, cystic lesions rather than surface-level spots
• Driven by fluctuations in oestrogen, progesterone, and testosterone
• Common in adult women, particularly those in their 20s, 30s, and 40s
• May be associated with conditions like PCOS (polycystic ovary syndrome)

Sugar / Dietary Acne

• Can appear anywhere on the face, but often presents across the forehead, cheeks, and nose
• Flares 2–3 days after high-glycaemic dietary episodes, rather than on a hormonal cycle
• Tends to present as a mix of inflammatory papules, pustules, and congestion
• Driven by insulin spikes, IGF-1 elevation, and systemic inflammation
• Can affect any gender and any age group
• Often improves noticeably within 8–12 weeks of dietary changes

The Overlap

Here's the complication: sugar directly amplifies hormonal acne. Insulin spikes raise androgen levels, which is the same hormonal pathway that drives cycle-related breakouts. This means that if you're already prone to hormonal acne, a high-glycaemic diet will make it significantly worse, and reducing sugar can meaningfully reduce the severity of hormonal flares, even if it doesn't eliminate them entirely.

Dr. Bowe notes: "Chronic low-grade inflammation is the undercurrent beneath so many skin conditions, including acne. When patients clean up their diet; reducing sugar, increasing fibre and omega-3s, I often see a meaningful reduction in inflammatory lesions within a few months. It's not a replacement for treatment, but it's a powerful complement to it."

If your acne is cyclical and concentrated on the lower face, hormonal therapy (such as the oral contraceptive pill or spironolactone) may be appropriate alongside dietary changes. A dermatologist can help you identify the primary driver and tailor a treatment plan accordingly.

Does Not Eating Sugar Help with Acne?

The short answer: yes, for many people, but the degree of improvement varies, and it's rarely the only change needed.

The evidence consistently shows that reducing high-glycaemic foods leads to measurable improvements in acne severity, particularly for inflammatory and cystic lesions. The mechanism is well-established: lower glycaemic load → lower insulin → lower androgens → less sebum → fewer blockages and less inflammation.

What the research does not support is the idea that eliminating sugar alone will clear acne entirely for everyone. Acne is multifactorial. Genetics, hormonal status, gut health, stress levels, sleep quality, skincare habits, and environmental factors all play a role. Diet is one lever; a significant and controllable one, but it works best as part of a comprehensive approach.

Dr. Valori Treloar, dermatologist and co-author of The Clear Skin Diet, summarises it well: "The research is now robust enough that I feel comfortable telling patients: your diet matters. It's not the only factor, and it's not the same for everyone, but for a significant proportion of acne sufferers, dietary changes, particularly reducing high-glycaemic foods, can make a real, measurable difference."

Practically speaking, most people who reduce high-glycaemic foods and increase anti-inflammatory foods report:

• Fewer new breakouts forming
• Reduced severity and size of existing lesions
• Faster healing of active spots
• Less overall skin congestion and oiliness
• Improvements in skin tone and radiance (partly due to reduced glycation)

Allow at least 8–12 weeks before assessing results, skin cell turnover takes approximately 28 days, and dietary changes need time to shift the underlying hormonal and inflammatory environment.

How to Prevent Acne After Eating Sugar

Life happens. Birthdays, celebrations, travel, and stress all bring moments where a high-glycaemic meal is inevitable or simply chosen.

Here's how to minimise the skin impact when you do indulge:

1. Pair Sugar with Protein, Fat, or Fibre

The glycaemic impact of any food is significantly blunted when consumed alongside protein, healthy fat, or fibre. A piece of cake after a balanced meal with protein and vegetables produces a far gentler insulin response than the same cake eaten alone on an empty stomach. This is one of the most practical and sustainable strategies for managing dietary acne triggers without eliminating enjoyment.

2. Move After Eating

Even a 10–15 minute walk after a high-carbohydrate meal has been shown to significantly reduce post-meal blood glucose spikes. Muscle contractions during movement use glucose directly, reducing the amount that enters the bloodstream and the corresponding insulin response. This is a simple, evidence-based intervention that requires no dietary restriction.

3. Stay Hydrated

Adequate hydration supports kidney function and helps flush excess glucose and metabolic by-products from the body more efficiently. It also supports skin barrier function and reduces the concentration of inflammatory compounds in the bloodstream.

4. Support Your Skin Barrier Immediately

After a high-sugar period, prioritise your skincare routine. A gentle cleanser, a niacinamide serum (to regulate sebum and calm inflammation), and a non-comedogenic moisturiser will help your skin manage the increased oil production that follows an insulin spike. Don't skip SPF, UV exposure worsens any inflammation already present in the skin.

5. Prioritise Sleep That Night

Sleep is when your skin repairs itself. Poor sleep elevates cortisol, which compounds the inflammatory and sebum-stimulating effects of a high-glycaemic meal. Protecting your sleep after an indulgent day is one of the most underrated skin recovery strategies.

6. Return to Your Baseline Quickly

One high-sugar day will not derail months of dietary progress. The key is returning to your low-glycaemic baseline at the next meal rather than allowing a single indulgence to cascade into days of poor eating. Consistency over time is what determines your skin's baseline state, not any single meal.

Foods Most Likely to Trigger Acne

Not all foods affect all people equally, but the following categories are most consistently associated with acne flares in the research literature:

High-Glycaemic Carbohydrates

The primary dietary acne trigger. These cause rapid blood sugar spikes and the insulin-androgen-sebum cascade described above.

• White bread, white rice, refined pasta
• Sugary drinks — sodas, commercial fruit juices, energy drinks, sweetened teas and coffees
• Sweets, chocolates (particularly milk chocolate), and baked goods made with refined flour
• Processed breakfast cereals — most are far higher in sugar than their packaging implies
• Fast food, which combines high-GI carbohydrates with inflammatory fats

Dairy — Particularly Skimmed Milk

Multiple studies have found an association between dairy consumption; especially low-fat and skimmed milk, and increased acne risk. The proposed mechanisms include elevated IGF-1 levels and the presence of hormones naturally occurring in cow's milk. Interestingly, skimmed milk appears more problematic than full-fat dairy, possibly because the fat in whole milk moderates the hormonal response.

Dr. Zeichner notes: "Dairy, particularly low-fat and skimmed milk, has been associated with acne in multiple studies. The exact mechanism isn't fully understood, but it likely involves the hormones naturally present in milk and their effect on IGF-1 levels. I often suggest patients experiment with reducing dairy for 6–8 weeks to see if it makes a difference for them."

Fermented dairy (yoghurt and kefir) appears to be better tolerated and may even support skin health via the gut-skin axis.

Alcohol

Alcohol (particularly beer and sweet cocktails) has a high glycaemic impact, disrupts sleep, depletes the skin of key nutrients (including zinc and vitamin A), and promotes systemic inflammation. It also impairs liver function, which plays a role in hormone metabolism. Regular alcohol consumption is a meaningful but often overlooked acne trigger.

Whey Protein

Whey protein supplements have been associated with acne flares in several studies, likely because whey is derived from milk and has a significant IGF-1-stimulating effect. Athletes and gym-goers who develop sudden adult acne after starting a whey supplement should consider this as a potential trigger. Plant-based protein alternatives (pea, hemp, rice protein) do not carry the same risk.

Highly Processed Foods

Ultra-processed foods; packaged snacks, instant noodles, flavoured crisps, fast food, combine multiple acne triggers: high glycaemic load, inflammatory seed oils, excess sodium, and minimal fibre. They also tend to displace the whole, nutrient-dense foods that actively support skin health.

Evidence From Studies

The 2022 Systematic Review

A comprehensive 2022 systematic review and meta-analysis, which pooled data from multiple controlled trials and observational studies, confirmed a statistically significant association between high-glycaemic diets and acne severity. The review found that low-glycaemic dietary interventions consistently reduced total acne lesion counts, inflammatory lesion counts, and sebum production across diverse study populations. The authors concluded that dietary modification, specifically glycaemic load reduction, should be considered a legitimate adjunct to standard acne treatment, not merely an anecdotal intervention.

Importantly, the review also noted that the effect size was clinically meaningful: participants on low-glycaemic diets saw reductions in acne lesion counts comparable to some topical treatments, without the side effects associated with pharmaceutical interventions.

The French Study (2020, ~24,000 Participants)

One of the largest dietary acne studies to date, published in JAMA Dermatology in 2020, analysed data from approximately 24,000 participants in the French NutriNet-Santé cohort. The study found that:

• Participants who reported current acne were significantly more likely to consume high quantities of sugary drinks, milk, and fatty or sugary products
• The association between sugary drinks and acne was particularly strong, those who consumed sugary beverages daily had a markedly higher prevalence of acne compared to non-consumers
• The link between diet and acne was observed across all age groups, not just adolescents, challenging the assumption that adult acne is purely hormonal
• Milk consumption (particularly skimmed milk) was independently associated with acne prevalence, consistent with earlier studies

The scale of this study — 24,000 participants across a nationally representative French population, gives its findings considerable weight. While observational in design (and therefore unable to establish causation alone), the associations were robust after controlling for confounding variables including age, sex, BMI, and smoking status.

Johns Hopkins and the Glycaemic Diet Connection

Researchers affiliated with Johns Hopkins Medicine have contributed to the growing body of evidence linking diet and skin health, particularly through the lens of the gut-skin axis and systemic inflammation. Their work supports the understanding that the Western diet; characterised by high glycaemic load, excess saturated fat, and low fibre, creates a pro-inflammatory physiological environment that manifests on the skin as acne, rosacea, and accelerated ageing.

Johns Hopkins dermatologists have also highlighted the role of the gut microbiome in mediating the diet-skin relationship. A disrupted gut microbiome; driven by high-sugar, low-fibre diets, impairs immune regulation and increases intestinal permeability ("leaky gut"), allowing inflammatory compounds to enter the bloodstream and trigger skin inflammation. This gut-skin axis is an area of active and rapidly evolving research.

The Landmark Australian Study (American Journal of Clinical Nutrition)

A frequently cited randomised controlled trial published in the American Journal of Clinical Nutrition assigned acne patients to either a low-glycaemic diet or a high-glycaemic control diet for 12 weeks.

The low-glycaemic group experienced:

• A significant reduction in total acne lesion count
• Reduced inflammatory lesion count specifically
• Improvements in insulin sensitivity
• Reductions in androgen levels
• Reductions in IGF-1

This study was significant because it demonstrated not just a correlation but a plausible causal mechanism, the dietary change produced measurable hormonal shifts that directly corresponded to skin improvement. It remains one of the strongest pieces of evidence for the diet-acne link.

Population Studies: The Acne-Free Societies

Perhaps the most striking evidence comes from anthropological research. Studies of communities in Papua New Guinea and the Aché hunter-gatherers of Paraguay; populations consuming traditional, low-glycaemic, unprocessed diets, found virtually zero acne among adolescents and adults. When members of these communities transitioned to Westernised diets, acne rates rose to match those seen in industrialised nations. These findings, published by dermatologist Dr. Loren Cordain and colleagues, suggest that acne may be, in significant part, a disease of dietary modernity rather than an inevitable biological phenomenon.

How Sugar Affects and Causes Acne: A Summary of the Pathways

To bring it all together, here is a clear overview of the mechanisms by which sugar and high-glycaemic foods contribute to acne:

The Insulin-Androgen Pathway

High-GI food → blood glucose spike → insulin release → androgen stimulation → increased sebum production → pore blockage → acne formation.

The IGF-1 Pathway

High-GI food → elevated IGF-1 → hyperkeratinisation (excess skin cell production) → pore blockage → comedone formation. IGF-1 also amplifies androgen activity, compounding the sebum problem.

The Inflammatory Pathway

High sugar intake → systemic inflammation → inflammatory cytokine release → skin inflammation → inflammatory acne lesions (papules, pustules, cysts). This pathway also impairs the skin's ability to heal and increases the risk of PIH.

The Gut-Skin Axis

High-sugar, low-fibre diet → gut dysbiosis (disrupted microbiome) → increased intestinal permeability → inflammatory compounds enter bloodstream → immune dysregulation → skin inflammation and acne.

The Oxidative Stress Pathway

High blood glucose → free radical generation → oxidative stress → degraded skin antioxidant defences → impaired barrier function → worsened acne and accelerated skin ageing.

Glycation

Excess sugar → sugar molecules bind to collagen and elastin → formation of AGEs → weakened skin structure, impaired repair, dullness, and accelerated ageing. While not a direct acne pathway, glycation impairs the skin's resilience and recovery capacity.

The South African Context

In South Africa, our diets often include high-glycaemic staples; white bread, pap, vetkoek, sugary beverages, and a wide range of processed snack foods. These are deeply embedded in our food culture, and sustainable change is always preferable to dramatic restriction. But awareness is the first step.

Add to this South Africa's intense UV environment, among the highest UV index readings in the world, which worsens oxidative stress, impairs barrier function, and significantly exacerbates PIH. For South African skin, the combination of a high-glycaemic diet and inadequate sun protection creates a particularly challenging environment for acne management.

Addressing diet, a targeted skincare routine, and daily broad-spectrum SPF together is the most effective approach, not any single intervention in isolation.

Your Skincare Routine Still Matters

Dietary changes work best alongside a consistent, evidence-based skincare routine. As Dr. Treloar emphasises: "Diet and skincare are not either/or. They work on different pathways and they complement each other. The patients who see the best results are those who address both simultaneously, cleaning up their diet while also using evidence-based topical treatments."

• Gentle, non-stripping cleanser — removes excess oil without triggering rebound sebum production → Shop Cleanser
• Niacinamide — regulates sebum, calms inflammation, strengthens the barrier, and fades PIH → Shop Treatment Serum
• Azelaic acid — targets both active acne and hyperpigmentation; gentle enough for sensitive skin → Shop Exfoliating Serum
• Salicylic acid — penetrates pores to dissolve blockages; ideal for congested, oily skin → Shop Exfoliating Serum
• Non-comedogenic moisturiser — essential even for oily skin; skipping it worsens oil production → Shop Moisturiser
• Broad-spectrum SPF daily — non-negotiable in South Africa; UV exposure worsens PIH and slows healing.

Key Takeaway

Sugar doesn't cause acne in isolation, but a high-glycaemic diet creates the hormonal and inflammatory conditions in which acne thrives. The evidence is now robust: reducing high-glycaemic foods, supporting gut health, managing stress and sleep, and pairing dietary changes with a targeted skincare routine produces meaningful, measurable improvements in acne for a significant proportion of people.

You don't need to eliminate sugar forever. You need to be consistent, informed, and patient. Start with one swap this week. Choose whole grain over white. Swap the sugary drink for water or green tea. Pair your treats with protein or fibre. Apply your SPF. Small changes, consistently made, are the foundation of lasting skin health.

And if you've done all of this and your skin still isn't responding, see a dermatologist. As Dr. Bowe reminds her patients: "Acne is a medical condition, not a moral failing. There is no shame in needing prescription support. The goal is clear skin, and there are many paths to get there."

Looking for skincare formulated for South African skin? Explore our targeted treatments for acne, hyperpigmentation, and barrier repair, crafted with local skin needs, climate, and skin tones in mind.