Global Acne Prevalence Rises 63% Since 1990
Global Acne Burden Up 63% Since 1990, Projected to Rise Through 2050
Top acne risk factors
Claude AI - Oct 2026
The strongest acne risk factors in large reviews are family history, higher BMI, adolescent age, and oily skin. Vitamin D deficiency, dairy, and high-glycemic diets are moderately or inconsistently supported.
| Risk factor | Evidence strength | Effect size | Ref |
|---|---|---|---|
| Parental family history | Strong | OR 2.91 (2.58–3.28) | Sci Rep 2020 |
| Overweight/obese BMI | Strong | OR 2.36 (1.97–2.83) vs normal/underweight | Sci Rep 2020 |
| Adolescent age | Strong | Consistent across many studies | Sci Rep 2020 |
| Oily skin type | Strong | Consistent; also predicts severe acne | Sci Rep 2020 Severe MA 2022 |
| Vitamin D deficiency | Moderate (observational) | OR 2.97 (1.68–5.23); 25(OH)D ~9 ng/mL lower | Dermatology 2022 |
| Dairy intake | Moderate, mixed | Any dairy OR 1.25; skim milk OR 1.32 | Nutrients 2018 |
| High glycemic load | Mixed | Modest effect in a review; null in a newer meta-analysis | JAAD Int 2022 UPH MA |
| Whey protein supplements | Limited | OR 3.94 in one study | JAAD Int table |
| Male sex | Affects severity more than occurrence | Severe acne OR 1.16; scarring OR 1.58 | Severe MA 2022 Scar MA 2023 |
| Smoking | Inconsistent | Studies conflict | Sci Rep 2020 |
Vitamin D. The meta-analysis pooled 13 studies (1,362 patients, 1,081 controls). Lower vitamin D levels also tracked with more severe acne. However, heterogeneity was high (I² = 72%), and case-control data can't show which way causation runs [Dermatology 2022].
- The 2022 meta-analysis found a 3X increase if low Vitamin D.
Dairy. Milk risk rose with intake: OR 1.41 at one glass a day and 1.43 at two or more. But the authors found publication bias, and the effects shrank after adjustment [Nutrients 2018].
Glycemic load. A 2022 systematic review found a modest effect, supported by randomized trials [JAAD Int 2022]. A more recent meta-analysis found no significant pooled association for glycemic load, dairy, or fatty acids [UPH MA].
Hormones and drugs. Population surveys capture these less well, but clinically they are well-established triggers:
- Excess androgens, including polycystic ovary syndrome (PCOS)
- Premenstrual flares
- Corticosteroids
- Anabolic steroids or testosterone
- Lithium
Sources:
- [Sci Rep 2020 – Epidemiology of acne review]
- [Med Alphabet 2022 – Severe acne risk factors meta-analysis]
- [Skin Res Technol 2023 – Acne scar meta-analysis]
- [Dermatology 2022 – Vitamin D and acne meta-analysis]
- [Nutrients 2018 – Dairy and acne meta-analysis]
- [JAAD Int 2022 – Diet and acne review]
- [JAAD Int 2022 – Observational studies table]
- [UPH – Glycemic load, dairy, fatty acids meta-analysis]
The Top Vitamin Deficiency with Acne
14,000 studies have acne topical and "Vitamin D" as of Oct 2026
60,000 studies have skin, topical and "vitamin D" as of Oct 2026
Related in VitaminDWiki
Many things reduce levels of Vitamin D
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- If you eat ultra-processed foods, you need Vitamin D
- Microplastics reduce Vitamin D and Magnesium, Vitamin D reduces MP toxicity
- Vitamin D Receptor deactivated by some health problems - many studies
- 20+ chronic stressors result in poor health (most are fought by Vitamin D)
Many stressors reduce Vitamin D levels