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Does diet affect acne?

Clinical review pending

What studies show about acne, glycemic load, dairy, chocolate, whey protein, and practical dietary changes.

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Does diet affect acne?

What you eat can influence acne, but food is only one part of the picture. No diet reliably clears acne for everyone. The most consistent evidence concerns glycemic index and glycemic load: diets that produce a greater blood sugar response have been associated with both the development and severity of acne. The evidence for other commonly blamed foods is less consistent. Acne overview Source

Acne is common. A 2015 epidemiologic review cited an estimated global prevalence of 9.4%, ranking it as the eighth most prevalent disease in the data reviewed, with the highest rates among adolescents after puberty. That is a historical estimate, not a new count of everyone affected today. Source

Dietary changes can be part of treatment. They work alongside appropriate skin care and medication when needed, rather than making those treatments unnecessary. American Academy of Dermatology

How diet may influence acne

Several processes come together in acne vulgaris: changes in the sebaceous glands and the oil they produce, blocked hair follicles, activation of the innate immune system, and an altered skin microbiome that includes Cutibacterium acnes. Simply having more bacteria does not explain the condition. Neither does poor hygiene. Source

These processes help explain why researchers study food in relation to acne. Diet may affect some of them, but a plausible mechanism is not the same as proof that a particular food causes a breakout. Two pathways receive particular attention: insulin and insulin-like growth factor 1, and the effects of androgens on oil production.

Blood sugar, insulin, and IGF-1

Insulin is central to the proposed link between carbohydrate intake and acne. Glycemic index describes a food’s blood sugar response under standardized conditions; glycemic load also accounts for the amount of carbohydrate in a serving. A high glycemic index does not automatically mean that every serving has a high glycemic load. Insulin signaling can influence how sebocytes, the cells in oil glands, make fats and produce sebum. Glucose Source

Insulin-like growth factor 1, or IGF-1, is another part of this pathway. Its levels rise during puberty and have been linked to the course of acne. Mechanistic research describes effects on 5-alpha-reductase, androgen production in the adrenal glands and gonads, androgen receptor signaling, sebocyte growth, and fat synthesis. These mechanisms offer possible explanations for an association; they do not establish a food trigger in an individual person. IGF-1 Source

A two-week randomized trial provides a small piece of intervention evidence. In the low-glycemic-index and low-glycemic-load group, IGF-1 decreased from 267.3 ± 85.6 to 244.5 ± 78.7 ng/mL (P = 0.049). This was a before-and-after comparison within that group. Changes in glucose, insulin, IGF-binding protein 3, and insulin resistance did not differ between the groups over the two weeks. A short-term biomarker change does not establish that acne lesions will improve. Source

Androgens, sebum, and inflammation

Androgens help explain why acne often appears around puberty: they stimulate the sebaceous glands and increase oil production. The same mechanistic literature reports associations among IGF-1, DHEA sulfate, dihydrotestosterone, lesion counts, and facial sebum secretion. Hormonal factors can also contribute to persistent acne in adult women, but hormones and diet are not mutually exclusive explanations, and acne alone does not establish a hormonal disorder. Source

The metabolic picture is relevant too. A systematic review and meta-analysis found higher average measures of insulin resistance in people with acne than in controls. A group average does not mean that everyone with acne has insulin resistance. Source

Inflammation is part of acne biology, not simply a final step in a fixed sequence. One cross-sectional study reported higher mean high-sensitivity C-reactive protein in severe acne (3.0 ± 0.10 mg/L) than in milder disease, with severity also correlated with interleukin-6 and malondialdehyde. These are nonspecific markers of inflammation and oxidative stress, not diagnostic tests for acne or established ways to track a dietary response. High-sensitivity CRP Source

Together, these findings describe a possible route from diet through metabolic and hormonal signaling to changes in an acne-prone follicle. They do not show that every blood sugar rise leads to acne, or that food is the only influence on these pathways.

Foods associated with acne breakouts

The evidence differs by food. Lower-glycemic-load diets have been tested in randomized trials. Cow’s milk has repeatedly been associated with acne in observational studies and meta-analyses. Chocolate and whey protein have smaller or conflicting bodies of evidence. Dairy findings also vary across studies, including populations with different sexes, ethnic backgrounds, and eating habits. Source

Food or food group Reported finding Evidence and limits Possible alternative
High-glycemic carbohydrates and sugars Lower-glycemic-load diets reduced lesions in small trials Two randomized trials, one including skin biopsies; not proof that every high-GI food is a trigger Whole grains, legumes, whole fruit
Cow’s milk Associated with more acne Repeated observational associations in three meta-analyses; causation uncertain Unsweetened, appropriately fortified plant-based milk if a substitution is useful
Yogurt and cheese Inconsistent associations Meta-analyses disagree No automatic need to change
Whey protein supplements Possible association Observational signal not confirmed in a small randomized trial A different protein source if whey seems to be a personal trigger
Chocolate Worsening reported in small studies Short crossover and uncontrolled studies Smaller or less frequent portions if a pattern is apparent
Sugary drinks and energy-dense eating patterns Associated with current acne in adults Cross-sectional evidence Water or unsweetened drinks

Source Source Source Source Source Source Source Source Source

High-glycemic carbohydrates and sugars

This is where the most consistent dietary intervention findings lie. In a 12-week study of 43 men ages 15–25, total lesion counts fell more with a low-glycemic-load diet (−23.5 ± 3.9) than with the control diet (−12.0 ± 3.5; P = 0.03). Insulin sensitivity also improved more in the intervention group. The researchers assessing the skin did not know the participants’ group assignments. However, the low-glycemic-load group also lost weight, so the study could not isolate glycemic load as the only explanation. Source Insulin resistance

A second randomized trial followed 32 people with mild to moderate acne for 10 weeks. A low-glycemic-load diet reduced inflammatory and noninflammatory lesions. Skin biopsies also showed smaller sebaceous glands, less inflammation, and reduced expression of sterol regulatory element-binding protein 1 and interleukin-8. Those tissue findings add biological context to the clinical results, although the trial was small. Source

Foods that can contribute to a high glycemic load include:

  • White bread
  • White rice
  • Sugary breakfast cereals
  • Potatoes
  • Candy and desserts
  • Sugar-sweetened drinks

Portion size, preparation, and the rest of the meal matter. This list is a starting point for understanding an eating pattern, not a reason to ban every food on it.

Cow’s milk, yogurt, and cheese

Several research groups have reported an association between milk and acne. A meta-analysis of 14 observational studies involving 78,529 people ages 7–30 found an odds ratio of 1.25 for dairy overall (95% confidence interval, or CI, 1.15–1.36) and 1.28 for milk (1.13–1.44). The reported dose pattern ranged from an odds ratio of 1.24 for two to six glasses a week to 1.43 for at least two glasses a day. The authors also found publication bias and weaker associations after adjustment for other factors. Source

Another meta-analysis reported a pooled odds ratio of 1.16 for milk overall (95% CI 1.09–1.24). The association was stronger for skim milk, at 1.24 (1.13–1.37), than for whole milk, at 1.13 (1.05–1.21). That pattern makes milk fat alone an unlikely explanation, but it does not identify the cause of the association. Source

Findings for fermented dairy are less consistent. One meta-analysis reported odds ratios of 1.36 for yogurt (95% CI 1.05–1.77) and 1.22 for cheese (1.00–1.50). Another dose-response analysis found no significant association for either, while reporting odds ratios of 1.48 for milk overall (1.31–1.66) and 1.82 for skim milk (1.34–2.47). Milk shows a recurring signal; yogurt and cheese do not show the same consistency. Source Source

Dairy product Association with acne How to interpret it
Cow’s milk overall Odds ratio 1.28 (1.13–1.44) in one analysis Associations recur across meta-analyses
Whole milk Odds ratio 1.13 (1.05–1.21) Smaller association than skim milk within the same analysis
Skim or low-fat milk Odds ratios as high as 1.82 (1.34–2.47) A recurring signal that milk fat alone cannot explain
Yogurt 1.36 (1.05–1.77) in one analysis; no significant association in another Inconsistent findings
Cheese 1.22 (1.00–1.50) in one analysis; no significant association in another Inconsistent findings; the first interval reaches 1.00
Whey protein supplements More frequent use among participants with acne in a case-control study Observational evidence; a separate randomized trial did not confirm worsening

Source Source Source Source

The estimates in this table come from observational research. They do not establish that dairy causes acne. Figures from different meta-analyses also should not be treated as a precise ranking of products: the included studies and participants differ.

Whey protein supplements

Whey findings conflict. Among 201 male gym-goers in a case-control study, 47% of those with acne reported whey use in the previous three months, compared with 27.7% of controls (P = 0.0047). The association remained after statistical adjustment, but the design cannot establish cause and effect. Source

A six-month randomized noninferiority trial in 49 men with mild to moderate acne found a different result. The whey group received 30 g of whey plus 18 g of a non-whey supplement daily; controls received 46 g of a non-whey supplement. The reported between-group differences in total lesion counts were −5.99 for facial acne (95% CI −13.18 to 1.19; P = 0.09) and −2.18 for truncal acne (−11.83 to 7.48; P = 0.65). These are estimates for two body areas, not separate changes in the whey and control groups. The trial did not find that whey worsened acne relative to the comparison supplement. Its small size and specific population still leave uncertainty about individual reactions. Source

Chocolate and fast food: what the studies show

A chocolate study used a crossover design, so participants served as their own controls. All 92 participants with acne followed an anti-inflammatory eating pattern. During four-week periods that added 50 g of 85% cocoa chocolate daily, Investigator’s Static Global Assessment scores increased from 2.5 ± 0.7 to 3.4 ± 0.8 in one group and from 2.4 ± 0.7 to 3.5 ± 0.6 in the other (both P < 0.0001). The study did not identify which component of chocolate might explain the change. Source

A smaller uncontrolled study gave 25 acne-prone men 25 g of 99% cocoa dark chocolate daily. Acne scores, comedones, and inflammatory papules increased after two weeks. Because this chocolate contained very little sugar and no meaningful milk component, the finding raises questions beyond sugar alone. But a small study without a control group cannot separate the intervention from other influences or predict how everyone will respond. Source

A much larger study examined eating patterns in 24,452 adults. Current acne was associated with fatty and sugary products (adjusted odds ratio 1.54; 95% CI 1.09–2.16), sugary drinks (1.18; 1.01–1.38), milk (1.12; 1.00–1.25), and an energy-dense dietary pattern overall (1.13; 1.05–1.18). This was a cross-sectional analysis, so these are associations, not proof that the foods caused acne. Source

The practical distinction is between small randomized trials of glycemic load, a larger observational literature on milk, and more limited or conflicting findings for chocolate and whey. Combining them into one list of forbidden foods would give them a certainty they do not share.

Foods and nutrients that may support clearer skin

No single food or nutrient has been shown to clear acne reliably on its own. Most research here concerns symptom improvement or an addition to treatment. Diet alone is not an established substitute for acne care. American Academy of Dermatology

Low-glycemic and Mediterranean eating patterns

Low-glycemic-load diets have randomized trial evidence. In everyday meals, that can mean replacing some frequently eaten refined carbohydrates or sugary foods with options such as:

  • Whole grains
  • Legumes
  • Nonstarchy vegetables
  • Whole fruit
  • Nuts

The Mediterranean diet evidence is more mixed. A review of five case-control studies involving 765 participants found no statistically significant association between greater adherence and lower odds of having acne (odds ratio 0.32; 95% CI 0.08–1.28). Greater adherence did correlate with lower acne severity (r = −0.29; 95% CI −0.55 to −0.03). Higher vegetable intake was associated with lower odds of acne (0.46; 0.29–0.74). The authors rated the evidence as low quality, with substantial differences between studies. These findings suggest a possible relationship with severity, not proof that this eating pattern prevents acne. Source

Omega-3 fats, zinc, and antioxidants

Omega-3 findings are promising but limited. In a 10-week randomized double-blind study of 45 people with mild to moderate acne, inflammatory and noninflammatory lesions decreased in both the omega-3 group, which received 2,000 mg of EPA plus DHA, and the gamma-linolenic acid group. Histologic findings included less inflammation and reduced interleukin-8 staining. Improvements within small treatment groups should not be read as proof that everyone benefits. The authors considered these possible adjuncts to treatment. A separate clinical evaluation reported improvements in a subgroup and called for larger randomized trials. Source Source

Food sources of omega-3 fats include:

  • Fatty fish such as salmon and mackerel
  • Sardines
  • Walnuts
  • Flaxseed
  • Chia seeds

Fish supplies EPA and DHA. The plant foods mainly supply alpha-linolenic acid, or ALA, so a serving of seeds or nuts is not equivalent to the EPA/DHA supplement tested in that trial.

A systematic review found lower average serum zinc levels in people with acne than in controls. Zinc treatment was associated with improvement in inflammatory papule counts, with no statistically significant difference in adverse effects relative to the comparison treatments. That does not establish that zinc has no side effects. The treatment findings mainly concern supplements and inflammatory papules, not proof that eating more zinc-rich food will clear acne. Source

Probiotics and the gut-skin connection

The gut-skin axis is a proposed set of connections through which changes in the gut microbiome may influence inflammation and skin biology. This has led researchers to study probiotics as additions or alternatives to standard acne treatments. Explaining the pathway does not establish that a particular probiotic works. Source

A systematic review included 33 studies and 2,112 patients treated for 4–25 weeks with oral or topical products. It reported average total lesion reductions of 37.2% with prebiotics, 45.2% with probiotics, and 49.5% with postbiotics, compared with 37% in control arms. No serious adverse events were reported in the included studies. These are pooled summaries across varied products and study designs, not a single direct comparison showing that postbiotics are best or that an oral supplement will produce those percentages. Probiotics had the largest evidence base of the three categories, but larger standardized trials are still needed. Source

The evidence for supportive nutrients and microbiome products remains less established than standard acne treatment. A sustainable overall eating pattern is a more useful starting point than assuming that one supplement will solve the problem.

How strong is the evidence?

Much of the diet-and-acne literature is observational, while randomized trials are generally small and short. A systematic review selected 34 studies from 410 records and used an Ottawa quality assessment scale. It concluded that diet may contribute to acne, with glycemic load among the more consistently supported factors. Source

Several limitations recur:

  • Self-reported acne and food intake, plus incomplete responses, as in a prospective cohort of 4,273 boys. Source
  • Cross-sectional designs that cannot establish the direction of an association, as in the adult dietary analysis. Source
  • Publication bias and weaker estimates after adjustment in dairy meta-analyses. Source
  • Changes occurring alongside the intervention, such as weight loss in a low-glycemic-load diet group. Source
  • Small, short studies, often limited to men, such as the dark chocolate study involving 25 participants. Source

An odds ratio around 1.2–1.5 describes an association across groups. It does not tell you whether a particular food causes your breakouts, and it is not the same as an individual’s absolute risk.

Finding your own possible food triggers

Group-level associations cannot identify your personal trigger. If you notice a recurring pattern, recording what you eat and how your skin changes can be more useful than removing several food groups indefinitely. American Academy of Dermatology

Allow time for a meaningful pattern to emerge. A two-week trial found an IGF-1 change within the low-glycemic diet group, but no between-group differences in glucose, insulin, or insulin resistance. Trials that found changes in lesion counts lasted 10 and 12 weeks. About 8–12 weeks can be a reasonable practical window to discuss with your clinician, not a validated deadline by which every dietary change must work. Source Source

A four-week elimination and reintroduction approach

If a particular food seems linked to flares, a structured observation changes one thing at a time:

  • Record foods and skin lesions for a week before making a change, so you have a baseline.
  • Choose one plausible candidate from your own observations. Cow’s milk is one option because of the repeated associations, but everyone with acne does not need to eliminate it. Source
  • Keep that single change in place for four weeks while keeping other factors as consistent as practical.
  • Reintroduce the food deliberately and record what happens over another two to four weeks.
  • Reassess before trying another candidate rather than progressively removing multiple foods.

This is an informal observation, not a validated diagnostic test for acne triggers or food intolerance. Four weeks may be too short to judge the longer-term effect of an eating pattern. Normal fluctuations in acne, medications, stress, and menstrual cycles can also complicate interpretation. If you remove a whole food group, consider its nutritional contribution and discuss suitable replacements with a clinician or registered dietitian, especially before making a long-term change.

Which lab markers relate to diet and skin?

No blood marker diagnoses acne or identifies a food trigger. Some markers help researchers study the metabolic and hormonal pathways involved, but that does not make them a routine acne testing panel.

Examples include:

  • Fasting insulin and measures of insulin resistance. Insulin signaling affects sebocyte fat production, and studies report higher average insulin resistance in acne groups. That does not establish a need for routine insulin testing in everyone with acne. Insulin Insulin resistance Source Source
  • HbA1c and glucose. HbA1c reflects average glycemia over the preceding months, while a glucose test is a measurement at a particular time. Both concern metabolism, but neither proves that dietary glycemic load is causing acne. HbA1c Source
  • Total and free testosterone and DHEA sulfate. Androgens influence sebum, and persistent acne in adult women, particularly with other signs of androgen excess, can warrant a clinical hormonal assessment. Free testosterone Source
  • High-sensitivity C-reactive protein. This nonspecific inflammation marker was associated with severity in one cross-sectional study. It is not established as a routine way to monitor acne or a response to dietary changes. CRP testing Source

Testing should follow symptoms and clinical indications. These results need context; none confirms a dietary cause or replaces examination of the skin.

How diet can complement skin care and medication

Dietary adjustments can support a treatment plan. The 2024 American Academy of Dermatology guidelines strongly recommend treatments including benzoyl peroxide, topical retinoids, topical antibiotics, and oral doxycycline. Oral isotretinoin is strongly recommended for severe acne, acne causing scarring or substantial psychosocial burden, or acne that has not responded to standard treatment. Antibiotics should be used with measures to limit resistance, including benzoyl peroxide, rather than treated as an indefinite stand-alone solution. Source

Conditional recommendations include clascoterone, salicylic acid, azelaic acid, minocycline, sarecycline, combined oral contraceptives, and spironolactone. The right choice depends on the person and should be discussed with a clinician. Source

A dietary experiment is most useful when it fits alongside appropriate acne care. It should not delay treatment for painful or scarring disease. American Academy of Dermatology

When to see a dermatologist

Some situations call for clinical assessment rather than another round of food exclusions:

  • Severe acne, scarring, or acne that does not improve with over-the-counter care. Guidelines recommend isotretinoin in appropriate severe, scarring, or treatment-resistant cases. Source
  • Persistent acne in adult women with other signs of androgen excess, which can warrant evaluation for hormonal conditions such as polycystic ovary syndrome. Source
  • Acne that causes significant distress, regardless of how other people judge its appearance.

A dermatologist can identify the type and severity of acne and help choose treatment. Dietary changes can be part of that plan.

Frequently asked questions

Does diet affect acne?

It can, but food is not the whole explanation. High glycemic index and high dietary glycemic load are associated with acne development and severity, and small trials suggest that lowering glycemic load can improve lesions. No diet reliably clears acne for everyone. Appropriate skin care and medication remain important when needed. Acne overview Source American Academy of Dermatology

Which foods make acne worse?

The strongest dietary intervention evidence concerns glycemic load. Over 12 weeks in 43 men, lesion counts fell by −23.5 ± 3.9 with a low-glycemic-load diet versus −12.0 ± 3.5 with the control diet (P = 0.03). Milk has also been associated with acne, with an odds ratio of 1.28 in one meta-analysis (95% CI 1.13–1.44). In an adult study, current acne was associated with fatty and sugary products (adjusted odds ratio 1.54; 1.09–2.16) and sugary drinks (1.18; 1.01–1.38). None of these group findings identifies a universal trigger. Source Source Source

Does dairy cause acne?

Dairy is associated with acne in some studies, but causation is not established. Across 14 observational studies involving 78,529 people ages 7–30, the odds ratio for dairy overall was 1.25 (95% CI 1.15–1.36). Milk estimates ranged from 1.24 for two to six glasses weekly to 1.43 for at least two glasses daily. Another analysis found a stronger association for skim milk (1.24; 1.13–1.37) than whole milk (1.13; 1.05–1.21), which argues against milk fat as the sole explanation. Source Source

Do yogurt and cheese cause breakouts like milk?

They do not show the same consistent association. One meta-analysis reported odds ratios of 1.36 for yogurt (95% CI 1.05–1.77) and 1.22 for cheese (1.00–1.50). Another found no significant association for either, while reporting an odds ratio of 1.48 for milk overall (1.31–1.66). There is no clear basis here for advising everyone with acne to avoid yogurt and cheese. Source Source

Does chocolate cause acne?

Small short-term studies have reported worsening, but they do not settle the question for everyone. In a crossover study of 92 people with acne following an anti-inflammatory diet, four weeks of 50 g of 85% cocoa chocolate daily increased severity scores from 2.5 ± 0.7 to 3.4 ± 0.8 and from 2.4 ± 0.7 to 3.5 ± 0.6 in the two groups (both P < 0.0001). In an uncontrolled study, 25 men eating 25 g of 99% cocoa chocolate daily had increased acne scores, comedones, and inflammatory papules after two weeks. The responsible component and the extent to which the results apply to other people remain uncertain. Source Source

Does whey protein cause acne?

The evidence conflicts. In a case-control study of 201 male gym-goers, 47% of those with acne reported recent whey use versus 27.7% of controls (P = 0.0047). A six-month randomized trial of 49 men did not find worsening with a supplement containing 30 g of whey daily. Between-group differences were −5.99 facial lesions (95% CI −13.18 to 1.19; P = 0.09) and −2.18 truncal lesions (−11.83 to 7.48; P = 0.65). These figures refer to facial and truncal outcomes, not to changes in two separate treatment arms. An observational association and a small trial cannot predict every individual’s response. Source Source

How long does a dietary change take to show on the skin?

An observation period of about 8–12 weeks may be practical, but there is no guaranteed timetable. A two-week trial found a within-group IGF-1 decrease from 267.3 ± 85.6 to 244.5 ± 78.7 ng/mL (P = 0.049), without between-group differences in glucose, insulin, or insulin resistance. Trials that found lesion-count improvements lasted 10 and 12 weeks. A biomarker change and a visible improvement are different outcomes. Source Glucose Insulin Source Source

Can probiotics or omega-3 fats help acne?

Both are being studied as adjuncts. A review of 33 studies involving 2,112 patients treated for 4–25 weeks reported average lesion reductions of 45.2% with probiotics and 49.5% with postbiotics, compared with 37% in control arms. The studies used varied oral and topical products, so these pooled figures are not a direct treatment ranking or a prediction for a particular supplement. In a 10-week randomized trial of 45 people, lesion counts decreased in groups receiving omega-3 fats (2,000 mg EPA plus DHA) or gamma-linolenic acid. Larger studies are needed before drawing firm conclusions about who benefits and by how much. Source Source

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