Acne diet: what research says about food and skin

People with acne hear two opposite messages about food. One says diet has nothing to do with acne. The other says the right diet will clear it. The research supports neither. A few foods have a modest link to acne in studies, a few supplements have small trials behind them, and many popular food rules have no evidence at all. This guide brings the research together: what the guideline groups say, how strong the evidence is for each food and supplement, and how to test a food on your own skin safely. Skinli's shorter overview, does diet cause acne, answers the basic question of whether food matters.

Skinli gives general education and is not a doctor or dietitian. Talk to a doctor or registered dietitian before you cut out a food group or start a supplement.

What the guideline groups say

Three sources shape most medical advice on diet and acne.

The American Academy of Dermatology (AAD), 2024 guideline. The AAD's acne guideline, published in its journal in 2024, reviewed the research on diet. It found the evidence on a low glycemic load diet conflicting: three trials found fewer spots and one found no difference. It found the evidence insufficient to make any recommendation on a low-dairy diet, a low-whey diet, omega-3 fatty acids or chocolate. It also found the evidence insufficient for oral zinc, and it lists diet among the main gaps in acne research.

The AAD's advice to the public. The AAD's page on diet says small studies suggest that a low glycemic diet may reduce acne and that cow's milk may be linked to more breakouts. It adds that other studies found no link, and that more research is needed. Its practical advice is to watch whether a food seems to trigger breakouts and see what happens without it for a day, a week or a month.

NICE, England. NICE guideline NG198 tells doctors to advise people that there is not enough evidence to support specific diets for treating acne. The committee saw some evidence that a low glycemic diet may help. It chose not to recommend one, citing the weight loss seen in the trials, the effort of working out glycemic load, and concern about eating disorders, which most often start in the teenage years.

The three agree on the main point. Diet may play a part for some people, and no diet is proven as an acne treatment.

Diet is one cause among several

The NHS lists the main causes of acne: changes in hormone levels during puberty, periods, pregnancy and menopause; conditions such as polyendocrine metabolic ovarian syndrome (PMOS) and rosacea; some medicines; and products on the skin or hair that make it greasy. Its list names no food.

Family history has a strong link to acne in large surveys. In studies of 1,840 Malaysian Chinese adults and 3,888 Singapore Chinese adults, the authors concluded that having a parent or sibling with acne is a strong predisposing factor. A 2024 Indian study of 140 adults found that a family history of acne was linked to 10.24 times the odds of acne that started in adulthood.

Compared with these factors, the food links in the research are modest in size, and they appear in some studies and not others.

How strong is the evidence for each food

Food or drink	Best evidence	What it shows
Foods that raise blood sugar fast	Several small trials, many surveys	Fewer spots on a low glycemic diet in some trials after 10 to 12 weeks; no difference in others
Cow's milk	Large surveys, three pooled reviews	Modest link, strongest for skim milk; no trials
Chocolate	Three small trials since 2014	More spots within days to weeks on daily dark chocolate or cocoa
Whey protein	Case reports, two surveys, one 6-month trial	Case reports of flares; the trial found no worsening
Greasy and fast food	Surveys only	Mixed results; the AAD points to blood sugar as the likely link
Alcohol	Surveys and one laboratory study	Linked to acne in two Asian surveys
Gluten	Reviews and a genetic study	No link found

The details for each are in the hub guides. Foods that raise blood sugar fast have the most trials, covered in high glycemic foods and acne. The milk research, including why skim milk shows the strongest link, is in milk and acne. The chocolate trials are in chocolate and acne, and the gym shake studies are in whey protein and acne.

Foods with the least evidence

Some foods people often blame have almost no research behind them. When Skinli checked the medical research database PubMed in September 2026, it found:

• Water. One Indian study of 140 adults linked drinking less than 2 liters a day to adult acne. No trial has tested drinking more water for acne.
• Coffee. One 2026 study of 1,299 students aged 11 to 16 in Shanghai linked coffee, sugary drinks and milk tea to acne. It measured diet and acne at the same time, so it cannot show which came first.
• Spicy food. One 2016 Egyptian study of 400 people found no link between spicy food and acne severity or duration. The same study linked salty food to acne.
• Eggs, peanut butter, collagen and creatine. Skinli found no study that tested any of these as a cause of acne.

Greasy food, gluten and alcohol have more research each, and the results are covered in greasy food and acne, gluten and acne and alcohol and acne.

Eating patterns

Some research looks at whole ways of eating.

• Low glycemic eating. More vegetables, beans and steel-cut oats, and fewer sugary drinks, white bread and pastries. This has the most trials.
• Mediterranean eating. A 2025 review of 5 studies with 765 people found that closer adherence to the Mediterranean diet went with less severe acne, and that eating more vegetables went with lower odds of acne. The authors rated the evidence as low quality.
• Anti-inflammatory eating. A 2023 German study of 120 people with acne linked vegetables, legumes, oily fish, olive oil and nuts to benefit, and suggested limiting meat, cheese and alcohol. A 2024 trial found that daily dark chocolate still worsened acne in people following an anti-inflammatory diet.
• Ketogenic eating. A 2024 study of 31 women with obesity found acne scores fell 31 percent after 45 days on a low-calorie ketogenic diet. The women also lost weight, and there was no comparison group. A 2025 review calls the evidence on keto and skin limited.

A 2026 Shanghai study of school students found a related pattern. Students who had more items from a list of sugary and fatty foods and drinks had more acne, and those with all five items had 3.12 times the odds of acne compared with students who had one or none.

Supplements

Supplements sold for acne vary widely in evidence and in risk. The FDA says it does not have the authority to approve dietary supplements for safety and effectiveness before they are sold.

• Zinc has the most trials. Some found fewer red bumps, some found no benefit, and an antibiotic worked better in the largest one. Doses in acne trials were often above the NIH safe upper limit. See zinc for acne.
• Omega-3 fish oil reduced spots in one small 10-week trial, and eased the dryness of isotretinoin in another. See fish oil and acne.
• Vitamin A cleared acne in old trials only at doses 10 to 50 times the safe limit, and it can cause birth defects. See vitamin A and acne.
• Biotin has no study showing it causes acne, and it can cause false blood test results. See biotin and acne.

For supplements marketed for hormonal acne, such as DIM and spearmint, see supplements for hormonal acne and natural remedies for hormonal acne.

Keeping diet changes safe

Strict food rules carry their own risks, and the guideline groups take them seriously.

• Eating disorders. The NICE committee chose not to recommend acne diets partly because weight loss and close attention to food raised concerns about eating disorders in young people. If thoughts about food start to take over your day, talk to a doctor.
• Missing nutrients. Cutting out a food group can leave gaps. The NIH's digestive disease institute warns that a gluten-free diet without medical advice can fall short of fiber, iron and calcium. Plan the removal of a whole food group, such as all dairy, with a doctor or registered dietitian.
• Hormonal conditions. Acne linked to polycystic ovary syndrome has its own causes and treatments, covered in PCOS acne.

How to test a food on your own skin

The AAD's method is simple, and it works for any food or supplement:

1. Pick one suspect. Choose the food or drink you have most often and suspect most, such as a daily glass of milk, a protein shake or a sugary drink.
2. Take a photo of your skin in the same place and light. The progress tracker keeps photos in date order.
3. Go without it for up to a month, the longest period the AAD names. Change nothing else, including your skincare.
4. Compare the photos. If your skin looks the same, add the food back and move on to the next suspect.
5. Test the next suspect only after the first test ends, so you always know which change made the difference.

Diet works alongside treatment

The AAD says keeping skin clear requires more than a diet change: acne-friendly skincare and acne medicine help prevent new breakouts. The acne skincare routine covers each step and the ingredient strengths to start with. For a routine built from a photo of your own skin, analyze your skin.

The NHS says to see a GP if treating acne yourself has not helped, if you have many spots or they are deep, painful or scarring, if you have signs of a skin infection, or if acne is affecting your mental health. Those reasons apply whatever you eat.