What Foods Cause Acne in Adults? Most Research Stops at 30

The foods with the most evidence linking them to acne are high-glycemic carbs, the kind that raise blood sugar quickly, and cow's milk, especially skim. That evidence is weak, and nearly all of it comes from teenagers and people under 30. For an adult woman, it's a lead worth testing, not a rule.

You might be in your 30s or 40s with breakouts along your jaw. Someone has told you to quit dairy, sugar and chocolate all at once. Before you clear out the fridge, it helps to know who those studies were done on. The answer changes how much weight to give them.

What Foods Cause Acne, According to the Research?

No food has been shown to cause acne on its own. A few have been linked to more of it, mostly in young people. Here is where each one stands:

• High-glycemic foods: two small trials in people under 30 found fewer spots on a low-glycemic diet. Other studies found no link.
• Cow's milk, especially skim: linked to acne in large surveys of children, teens and young adults. These show a pattern, not a cause.
• Yogurt and cheese: the AAD and a large analysis don't agree. The analysis linked yogurt to acne and found a borderline result for cheese. The AAD says no studies have shown a link.
• Whey protein: only case reports, all in boys and men.
• Chocolate: one tiny trial in 14 men.

Does Sugar Cause Acne?

Sugar alone hasn't been tested much, but diets full of fast-digesting carbs have, and the results lean toward a modest link. The American Academy of Dermatology (AAD) says findings from small studies suggest that a low-glycemic diet may reduce acne. It also says other studies have not found a connection.

The AAD's examples of high-glycemic foods include white bread, corn flakes, puffed rice, potato chips, fries, doughnuts and pastries. Low-glycemic foods include most fresh vegetables, some fresh fruits, beans and steel-cut oats.

The best-known trial was in Australia. It enrolled 43 male acne patients aged 15 to 25 for 12 weeks. On the low-glycemic-load diet, total spots fell by about 23 on average, against about 12 on the usual diet.

There's a catch the headlines skip. The low-glycemic group also lost about 6 lb (2.9 kg). The authors said the effect of that weight loss still had to be separated from the diet itself. The AAD describes a second trial, in Korea, of 32 people aged 20 to 27 over 10 weeks.

Does Milk Cause Acne in Adults?

Very little research has looked at that question. The milk research is almost entirely about acne in children, teens and people under 30.

The study quoted most often looked at 47,355 adult women, but not at their adult skin. The AAD explains that they were asked to recall what they ate in high school. Women who remembered drinking 2 or more glasses of skim milk a day were 44% more likely to have had acne.

The AAD also describes two US surveys of 4,273 boys and 6,094 girls, all aged 9 to 15. In the girls' survey, those who drank the most cow's milk (whole, low-fat or skim) were more likely to have acne. In the boys' survey, the link was with skim milk.

The AAD says all types of cow's milk (whole, low-fat and skim) have been linked to acne. It adds that more research is needed to know for sure.

A 2018 analysis pooled 14 studies of 78,529 people aged 7 to 30. It left out studies of adult acne entirely. Any dairy was linked to slightly higher odds of acne, and low-fat or skim milk a little more.

The authors were careful about what that means. The studies varied a lot, there were signs of publication bias, and observational studies can't show that dairy causes acne.

The two sources don't agree on yogurt. The AAD says no studies have found that yogurt or cheese lead to more breakouts. The 2018 analysis found higher odds for yogurt and a borderline result for cheese. That kind of disagreement is a sign the evidence isn't settled.

Can Whey Protein Cause Acne in Women?

It might, but nobody has studied it in women. The evidence is a handful of case reports, the weakest kind of medical evidence, and every patient was male.

One report described five healthy adult men, all bodybuilders, who developed acne after taking whey protein. Another described five teenage boys aged 14 to 18 whose acne began after starting whey. Most cleared after stopping it, and one flared again when he started it again.

Whey comes from milk, which is why researchers suspect it. If your breakouts started within a few months of adding a whey shake, pausing it is a fair test. If you're using it to hit a protein target, how much protein women need covers what food can supply.

Does Chocolate Cause Acne?

The best trial was too small to say, and it left women out. It gave 14 men aged 18 to 35 with a history of acne capsules of unsweetened cocoa, gelatin or a mix in one sitting. Spots rose over the next week, and higher cocoa doses were linked to bigger rises.

That was a single large dose, not a square after dinner. The authors themselves wrote that, because no women took part, how far the results apply to women is "greatly diminished."

Do Any Foods Help Clear Skin?

Nothing has been proven to clear acne on its own. The most promising lead is fish oil, and even that is thin.

A 10-week trial gave 45 people with mild to moderate acne capsules of either omega-3 fats or borage oil, or nothing. Both supplement groups had fewer spots, and no serious side effects were reported. That's one small trial of supplements, not of eating more fish.

The low-glycemic foods the AAD lists, such as vegetables, beans and steel-cut oats, are reasonable to eat more of anyway. Just don't expect them to replace treatment.

Why Food Is Rarely the Main Cause of Adult Acne

For women past their teens, the AAD's adult acne page doesn't mention diet. It lists hormone changes around periods, pregnancy, perimenopause and menopause, and after starting or stopping the pill. Stress, hair and skin products, some medicines and an undiagnosed medical condition can also play a part.

Those causes have treatments with much stronger evidence than any diet. Hormonal acne treatment and its timeline covers what works, and why acne continues into your 30s and 40s explains the adult picture.

Waiting has a cost on brown and Black skin. The AAD says dark spots after acne can last much longer than the acne. If acne becomes moderate or severe before it's treated, it says, the risk of dark patches and raised keloid scars goes up. Why acne marks last longer on dark skin goes into fading them.

How to Test a Food Without Cutting Everything

Test one food at a time. The AAD suggests noticing whether a food seems to trigger breakouts, and what happens when you avoid it for a day, a week or a month. The trials ran 10 to 12 weeks, so a few days tells you little.

If milk is your suspect, keep your calcium up while you test. The NIH says adults aged 19 to 50 need 1,000 mg a day, rising to 1,200 mg for women from 51. If you cut dairy, you'll need other sources of calcium, as the NIH notes for people who avoid milk. Options include canned salmon or sardines with bones, kale, broccoli, some tofu and fortified soy or almond drinks.

Watch for the point where testing becomes a list of banned foods. The NIMH says becoming fixated on controlling their food intake may be a sign of an eating disorder. These can be treated successfully, so talk to a doctor if food rules are crowding out meals or taking over your thoughts. The NIMH also points to findtreatment.gov for finding care in the US.

If you're struggling and need to talk now, call or text 988 any time in the US or Canada. That reaches the 988 Suicide & Crisis Lifeline in the US and the 9-8-8 Suicide Crisis Helpline in Canada. If your life is at risk or you can't keep yourself safe, call 911 or go to the nearest ER.

In the UK and Ireland, Samaritans are free on 116 123, any time, and 999 is the UK emergency number. Elsewhere, call your local emergency number.

When to See a Doctor About Acne

The AAD's advice is simple: if nothing clears your acne, see a dermatologist. Go sooner if spots leave dark marks or scars. If acne started after a new medicine, keep taking it. Ask the prescribing doctor whether acne is a known side effect and whether there's an alternative.

Mention it if your acne comes with irregular periods or too much hair on the face, chin or body. Those can be signs of polycystic ovary syndrome (PCOS), which the Office on Women's Health says affects 1 in 10 women of childbearing age. Changing your diet won't diagnose it. A doctor can check for it with an exam and blood tests.

Frequently Asked Questions

Does Dairy Cause Acne for Everyone?

No. The studies show that, across large groups of young people, heavy milk drinkers had acne a little more often. They can't say whether milk affects your skin. The AAD says more research is needed.

How Long Should You Cut a Food to See if It Affects Your Acne?

The diet trials ran 10 to 12 weeks, so give it at least several weeks rather than days. Change one thing at a time, and keep using your acne treatment while you test.

Is Oat or Almond Milk Better for Acne?

No study has tested plant milks against cow's milk for acne. The link the AAD describes is with cow's milk. If you switch, fortified soy or almond drinks can still count toward your calcium, according to the NIH.