Diet can affect acne, though probably less than the internet would have you believe and in different ways than your mom warned you about. The two foods with the most evidence behind them are high-glycemic carbs (white bread, chips, sugary drinks) and cow's milk. Greasy food and chocolate, the classic suspects, have much weaker support.
If you've ever cut out dairy for a month, seen your skin improve, and then wondered whether it was the dairy or just a good month, you're asking the right question. Most of what we know comes from studies that can show a link but can't prove cause. A handful of small trials get closer, and they point in a consistent direction.
The Quick Answer
Research suggests diet can influence acne, mainly through high-glycemic foods and cow's milk. In a 12-week randomized trial of 43 young men, a low-glycemic-load diet cut total lesion counts by 23.5 on average, compared with 12.0 on a standard diet.1 A 2018 meta-analysis of 78,529 people aged 7 to 30 found that any milk intake was linked to 28% higher odds of acne.2 Neither finding makes diet a treatment on its own. The American Academy of Dermatology still says more research is needed, and effective acne care includes skin care and, often, medication.3 Defiant's Acne Bootcamp in Lisle, IL treats the skin directly and can factor diet in as one piece of the plan.
Foods and Acne at a Glance
| Food or pattern | Strength of evidence | What the research shows |
|---|---|---|
| High-glycemic carbs (white bread, fries, chips, pastries, sugary drinks) | Moderate: two small RCTs plus observational data | Low-glycemic diets reduced lesion counts in trials of 43 and 32 people14 |
| Cow's milk (whole, low-fat, skim) | Moderate, observational only | Any milk linked to 28% higher odds; skim milk 32%2 |
| Yogurt and cheese | Weak | Less consistent evidence than milk23 |
| Fatty and sugary products | Weak to moderate, observational | Linked to 54% higher odds of current acne in French adults5 |
| Chocolate | Weak | Evidence has been judged insufficient to recommend avoiding it6 |
Why Food Would Matter to Your Skin at All
Acne starts in the hair follicle, where oil (sebum), dead skin cells, bacteria, and inflammation stack on top of each other. Anything that turns up oil production or inflammation can make that pileup worse.
That's where blood sugar comes in. High-glycemic foods raise blood sugar quickly, and your body answers with a surge of insulin. Insulin and a related hormone, IGF-1, can signal the oil glands to grow and produce more sebum. The theory has held up reasonably well in the lab and in small human trials. It's also why the glycemic research gets taken more seriously than the old "greasy food causes pimples" idea, which never had a plausible mechanism behind it. Fries may be a problem, but if they are, it's more likely the refined potato than the oil.
What the Glycemic-Load Trials Found
The best-known trial came out of Australia in 2007. Researchers put 43 young men with acne, aged 15 to 25, on one of two diets for 12 weeks. One group ate a low-glycemic-load diet with about 25% of calories from protein and 45% from low-glycemic carbs. The other ate carb-dense foods without any attention to glycemic index.1
At 12 weeks, the low-glycemic group had lost an average of 23.5 lesions, compared with 12.0 in the control group. They also lost more weight and showed better insulin sensitivity, which is useful to know because it means you can't cleanly separate the diet effect from the weight-loss effect.1
A Korean trial in 2012 tested the same idea in 32 people with mild to moderate acne over 10 weeks. The low-glycemic group improved in both inflammatory and non-inflammatory lesions. Researchers also took skin biopsies and found smaller oil glands and less inflammation in the low-glycemic group.4 That's about as close as diet research gets to showing a change happening inside the skin rather than just on a lesion count.
Two trials with 75 people between them is still a small evidence base, and the AAD notes that other studies haven't found a link between high-glycemic eating and acne.3 The direction is encouraging, but nobody has run the large, long trial that would settle it.
The Dairy Question
Milk has a different story. It's a low-glycemic drink, so the blood sugar explanation doesn't fit, yet it shows up again and again in acne research.
The largest summary we have is a 2018 meta-analysis pooling 14 studies and 78,529 children, teens, and young adults. Compared with people who didn't drink milk, those who did had 28% higher odds of acne. The number was 32% for low-fat or skim milk and 22% for full-fat dairy.2 One older U.S. study of 47,355 women found that those who drank two or more glasses of skim milk a day in high school were 44% more likely to have had acne.3
Every one of those studies is observational. They asked people what they ate and whether they had acne, which leaves room for recall errors and for other habits that travel with milk drinking. Researchers suspect hormones naturally present in milk, or milk's effect on IGF-1, but that part is still theory.
Yogurt and cheese haven't shown as consistent a link as milk.23 If you're going to test dairy, milk is the place to start, and giving up cheese on day one probably isn't necessary.
What About Adults?
Most of this research was done in teens and people in their early twenties, which matters if you're 38 and dealing with jawline breakouts. The best adult data comes from a 2020 French study of 24,452 adults, average age 57, three-quarters of them women. After adjusting for other factors, current acne was linked to fatty and sugary products (54% higher odds), sugary drinks (18%), and milk (12%).5 The same caution applies: it's a survey, so it shows a pattern, not a cause.
Adult acne, especially in women, also tends to have a stronger hormonal component than teen acne. We covered that in more detail in our post on why adult acne doesn't respond to teen acne treatments. Diet can be one input, but hormonal breakouts usually need more than a menu change.
How to Test Whether Food Is a Trigger for You
The AAD's advice here is sensible: watch your breakouts, notice whether a specific food or drink seems to precede them, then cut it for a day, a week, or a month and see what happens.3 A few things make that experiment more useful.
Change one thing at a time. If you drop milk, sugar, and bread in the same week and your skin improves, you won't know which one mattered, and you'll be stuck avoiding all three.
Give it long enough. Acne lesions take weeks to form, so a food change won't show up in your skin for at least 6 to 8 weeks, and most acne research uses a 10- to 12-week window. We explain that timeline in how long it really takes to clear acne.
Keep a simple log. A photo of your skin every week in the same light, plus a note on what changed, beats relying on memory.
Don't turn it into a restriction spiral. If you notice yourself cutting whole food groups and your skin still isn't improving, that's a sign diet isn't the main driver and it's time for treatment that works on the skin directly.
Why Diet Alone Rarely Clears Acne
Even in the trials that worked, the low-glycemic groups still had acne at the end. Cutting lesion counts is real progress, but it's different from clear skin. The AAD is direct that keeping skin clear takes acne-friendly skin care and, for many people, medication.3
That's the gap Acne Bootcamp is built to fill. The program at Defiant in Lisle starts with a clinical skin analysis to figure out what's actually driving your breakouts, whether that's hormones, bacteria, clogged pores, or a barrier damaged by over-treating. From there, your provider builds a 6- to 12-week plan that can combine medical-grade in-clinic treatments, a home routine, prescription protocols where a provider decides they make sense, and barrier repair. Diet can come up in that conversation, especially for people who've noticed a pattern with milk or sugar, but it sits alongside treatment rather than replacing it.
- Research suggests diet can affect acne, with the most evidence for high-glycemic foods and cow's milk.
- In a 12-week trial, a low-glycemic-load diet reduced acne lesions by 23.5 on average versus 12.0 on a standard diet.
- A meta-analysis of 78,529 young people linked any milk intake to 28% higher odds of acne; yogurt and cheese haven't shown as consistent a link.
- Greasy food and chocolate have weak evidence behind them compared with sugar and refined carbs.
- Test one food change at a time for at least 6 to 8 weeks, and expect diet to help rather than clear acne on its own.
- Acne Bootcamp at Defiant in Lisle, IL pairs clinical skin analysis and in-clinic treatment with a plan that can include diet.
Frequently Asked Questions
Clear Skin Starts With a Plan.
Diet might be one piece of your acne, but it's rarely the whole thing. Acne Bootcamp starts with a clinical skin analysis and builds a 6- to 12-week plan around what's actually driving your breakouts, for clients across Naperville, Downers Grove, Wheaton, and Chicago's western suburbs.
Keep Reading
Last updated September 28, 2026.
References
- Smith RN, Mann NJ, Braue A, Mäkeläinen H, Varigos GA. A low-glycemic-load diet improves symptoms in acne vulgaris patients: a randomized controlled trial. Am J Clin Nutr. 2007;86(1):107-115. PubMed
- Juhl CR, Bergholdt HKM, Miller IM, Jemec GBE, Kanters JK, Ellervik C. Dairy intake and acne vulgaris: a systematic review and meta-analysis of 78,529 children, adolescents, and young adults. Nutrients. 2018;10(8):1049. PubMed
- American Academy of Dermatology. Can the right diet get rid of acne? AAD.org
- Kwon HH, Yoon JY, Hong JS, Jung JY, Park MS, Suh DH. Clinical and histological effect of a low glycaemic load diet in treatment of acne vulgaris in Korean patients: a randomized, controlled trial. Acta Derm Venereol. 2012;92(3):241-246. PubMed
- Penso L, Touvier M, Deschasaux M, et al. Association between adult acne and dietary behaviors: findings from the NutriNet-Santé prospective cohort study. JAMA Dermatol. 2020;156(8):854-862. JAMA Dermatology
- Reynolds RV, Yeung H, Cheng CE, et al. Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol. 2024;90(5):1006.e1-1006.e30. JAAD