The short answer: sugar alone does not cause acne, but high-sugar diets may make it worse for some people
Sugar does not directly cause acne the way bacteria does. But eating a lot of sugar—especially refined sugar in processed foods—can trigger changes in your body that make acne more likely to develop or flare up. The connection is indirect: high-sugar foods cause your blood sugar to spike, which prompts your body to release more insulin, which in turn can increase oil production in your skin and fuel inflammation. Whether this actually worsens your acne depends on your individual biology and how much sugar you consume.
The evidence is clearest for refined carbohydrates and sugary foods rather than sugar in isolation. A few studies have found that people who eat more refined carbs and added sugars tend to have more acne, while people eating lower-glycemic diets (foods that raise blood sugar more slowly) report fewer breakouts. But these studies are small, and they do not prove that cutting sugar will clear your skin—only that the pattern exists in some groups.
Key Takeaways
- Sugar itself does not cause acne directly, but high-sugar diets can increase insulin levels, which may boost oil production and inflammation in skin.
- The strongest evidence links refined carbohydrates and processed foods to acne, not sugar alone.
- Whether reducing sugar helps your acne depends on your individual skin and how much refined carbohydrate you currently eat.
- Other dietary factors—like dairy and certain oils—may affect acne independently of sugar.
- If you want to test whether sugar affects your breakouts, tracking your diet and skin for a few weeks is more reliable than guessing.
How sugar affects your skin at the biological level
When you eat refined sugar or refined carbohydrates, your blood glucose rises quickly. Your pancreas responds by releasing insulin to bring that glucose down. High insulin levels trigger a cascade of changes: your body produces more androgens (hormones that increase oil production), your skin cells multiply faster, and inflammatory molecules increase throughout your body. All three of these changes create conditions where acne bacteria thrive and pores become more likely to clog.
This is why the effect is strongest with refined carbs and added sugars rather than whole foods. An apple contains sugar, but it also contains fiber, which slows down how fast that sugar enters your bloodstream. Your blood glucose rises gradually, insulin stays lower, and the hormonal cascade is much gentler. A can of soda or a pastry, by contrast, sends your blood sugar spiking within minutes.
The timing matters too. A single high-sugar meal probably will not cause a breakout. But if you eat refined carbs regularly—multiple times a day—your insulin stays elevated, and your skin stays in that inflamed, oil-producing state. That is when acne is more likely to appear or worsen.
What research has found about sugar and acne
A 2012 study published in the journal Nutrients looked at 64 young men and found that those eating a low-glycemic diet (foods that raise blood sugar slowly) had fewer acne lesions after 12 weeks than those eating their normal diet. A 2016 review in Dermatology Practical & Conceptual concluded that high-glycemic foods and dairy were associated with acne in multiple studies, though the authors noted the evidence was not strong enough to make it a universal recommendation.
The limitation is important: these studies are small, they rely on people remembering what they ate, and they do not prove cause and effect. It is possible that people who eat low-glycemic diets also exercise more, sleep better, or have less stress—all of which affect acne. The studies show a pattern, not proof.
No major dermatology organization—including the American Academy of Dermatology—currently recommends cutting sugar as a primary acne treatment. But most acknowledge that diet may play a role for some people, and that the evidence for refined carbohydrates is stronger than for any single food.
Why some people see improvement and others do not
Your genes determine how sensitive your skin is to hormonal changes. Some people have skin that responds dramatically to even small shifts in insulin or androgens. Others have skin that barely reacts. If you have acne that flares with your menstrual cycle, or if acne runs in your family, you are more likely to be in the first group—and more likely to see improvement if you reduce refined carbs.
Your baseline diet also matters. If you already eat mostly whole foods and rarely have sugary drinks or processed snacks, cutting more sugar probably will not help much. If you drink soda daily and eat packaged foods regularly, reducing those could make a real difference. The people most likely to see improvement are those making the biggest change.
Acne is also multifactorial, meaning multiple things cause it at once. Even if sugar is making your acne worse, it might only account for 20 or 30 percent of the problem. Bacteria, clogged pores, hormones, and inflammation all play roles. Cutting sugar alone might improve your skin by a little, but it is unlikely to clear acne completely unless you also address the other factors.
Other foods that may affect acne more than sugar
Dairy has stronger evidence behind it than sugar does. Multiple studies have found that people who drink milk—especially skim milk—tend to have more acne. The theory is that milk contains hormones and proteins that may trigger inflammation or increase sebum production. If you drink a lot of milk, reducing it might help more than cutting sugar.
Omega-6 rich oils (found in vegetable oils, processed foods, and some nuts) may promote inflammation, while omega-3 oils (in fish, flax, and walnuts) may reduce it. Some people find that shifting the ratio helps their skin. Chocolate has been studied too, and while older research blamed it, newer studies suggest the sugar and milk in chocolate are the culprits, not the cocoa itself.
The point is that if you are trying to improve your acne through diet, you have multiple levers to pull. Sugar is one, but not necessarily the most important one.
How to tell if sugar is making your acne worse
The most reliable way is to track your diet and your skin for three to four weeks. Write down what you eat—especially refined carbs, sugary foods, and drinks—and note your breakouts each day. Look for patterns: do breakouts tend to appear two to three days after you eat a lot of sugar? Do they improve when you eat fewer refined carbs for a week? This personal experiment is more useful than any general advice, because your skin is individual.
If you want to test it more formally, try reducing refined carbs and added sugars for four weeks while keeping everything else the same. Eat whole grains instead of white bread, drink water instead of soda, and choose whole fruits instead of candy or pastries. If your acne improves noticeably, sugar was probably a factor. If nothing changes, it probably was not.
Be patient: skin takes time to respond. A breakout that appears today was usually triggered by something that happened days or even weeks ago. So changes in your diet will not show up immediately. Give any dietary change at least three to four weeks before deciding whether it worked.
What to do if you want to reduce sugar for your skin
Start by identifying where most of your added sugar comes from. For most people, it is drinks (soda, juice, sweetened coffee), snacks (candy, granola bars, pastries), and processed foods (yogurt, cereal, sauces). Replacing these with whole foods—water, fruit, nuts, vegetables, whole grains—will reduce your sugar intake without requiring you to count grams or follow a strict diet.
You do not have to eliminate sugar entirely. The goal is to reduce refined carbs and added sugars enough that your blood sugar stays more stable throughout the day. For some people, that means cutting sugary drinks. For others, it means eating fewer processed snacks. The amount that matters is individual.
If you reduce sugar and your acne does not improve, that is useful information too. It means you should focus on other factors: keeping your skin clean, managing stress, checking whether dairy affects you, or seeing a dermatologist about treatments that address the underlying causes of your acne.
Frequently Asked Questions
Will cutting out sugar completely clear my acne?
Probably not. Acne has multiple causes, and sugar is only one possible factor. Even if sugar is making your acne worse, eliminating it might improve your skin by 20 or 30 percent. You may also need to address bacteria, clogged pores, hormones, or inflammation through other means—like a skincare routine, stress management, or medical treatment.
How long does it take to see improvement after reducing sugar?
Skin takes time to respond to dietary changes. Most people who will see improvement notice it within three to four weeks, though some take longer. Breakouts that appear today were usually triggered days or weeks ago, so be patient before deciding whether the change worked.
Does natural sugar like honey or maple syrup affect acne differently than refined sugar?
Not significantly. Honey and maple syrup raise your blood sugar almost as quickly as white sugar does. The difference is that they contain trace minerals and antioxidants, but not enough to meaningfully change how your body responds. If you are trying to reduce the insulin spike, whole fruits (which contain fiber) are a better choice than any added sweetener.
If I eat sugar but exercise a lot, will that prevent acne?
Exercise helps with overall health and may reduce stress-related acne, but it does not cancel out the blood sugar spike from refined carbs. If you eat a lot of sugar, exercising does not prevent the insulin surge and hormonal changes that can trigger acne. That said, exercise has many other benefits, so it is worth doing regardless.
Should I avoid all carbs to prevent acne?
No. Whole grains, vegetables, and fruits are carbs, and they are good for your skin and your overall health. The problem is refined carbs—white bread, pasta, sugar, and processed foods—which raise blood sugar quickly. You can eat plenty of carbs and still reduce your acne risk by choosing whole foods over refined ones.