Foods That May Trigger Acne: What the Research Says

If you struggle with acne, it is natural to wonder whether something in your diet could be making your breakouts worse. You may have heard that chocolate causes acne, dairy is the problem, or sugar is always to blame. But the truth is more nuanced. Acne is a complex skin condition, and food is rarely the only cause. However, research does suggest that certain foods may worsen acne in some people, particularly foods that affect blood sugar, insulin, inflammation and hormone signalling (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). In this article, we will look at the foods that may trigger acne, what the research actually says, and how to work out whether your skin is reacting to something in your diet.

What Causes Acne?

Acne develops when pores become blocked with oil, dead skin cells and bacteria, leading to inflammation, blackheads, whiteheads, spots or deeper cystic breakouts (Baldwin and Tan, 2021). Common contributors to acne include:

• Hormonal changes
• Increased sebum production
• Inflammation
• Genetics
• Stress
• Gut health
• Sleep disruption
• Blood sugar imbalance
• Dietary triggers in some people

This means that acne is rarely about one single food. But for some people, food can be an important trigger or amplifier. For a wider explanation of acne causes, read What Causes Acne?.

Can Food Really Trigger Acne?

Food may not directly “cause” acne in everyone, but diet can influence several processes involved in acne development (Bowe and Logan, 2010; Meixiong and Bhutani, 2022). For example, some dietary patterns may increase insulin and insulin-like growth factor 1, also known as IGF-1. These pathways can influence sebum production, inflammation and skin cell turnover, which are all involved in acne (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). This is why researchers have become increasingly interested in the link between acne, high-glycaemic foods, dairy, Western dietary patterns and inflammation (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022).

1. High-Glycaemic Foods

High-glycaemic foods are foods that raise blood sugar quickly. These foods can increase insulin levels, which may influence androgen activity, sebum production and inflammation (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). Examples include: Several studies suggest that low-glycaemic diets may improve acne symptoms in some people. This does not mean you can never eat these foods, but frequent blood sugar spikes may be unhelpful if you are prone to acne (Bowe and Logan, 2010; Baldwin and Tan, 2021). A more skin-supportive approach is to build meals around protein, fibre, healthy fats and slower-releasing carbohydrates.

2. Dairy Products

Dairy is one of the most commonly discussed food groups when it comes to acne. Research has found an association between dairy intake and acne, particularly milk consumption. Some studies suggest the link may be stronger with skimmed or low-fat milk than full-fat dairy, although the reasons are not fully understood (Juhl et al., 2018; Meixiong and Bhutani, 2022). Milk may influence acne-related pathways because it can affect insulin and IGF-1 signalling. These pathways are involved in growth, oil production and skin cell behaviour (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). However, dairy does not trigger acne in everyone. Some people tolerate it well, while others notice that milk or whey-based products make their skin worse. For a deeper explanation, read: Does Dairy Cause Acne?

3. Whey Protein

Whey protein is derived from milk and is commonly used in protein powders, shakes and gym supplements. Some people notice new or worsening acne after starting whey protein, especially around the jawline, cheeks, chest or back. This may be because whey protein can stimulate insulin and IGF-1 pathways, which may worsen acne in susceptible individuals (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). If you started breaking out after adding protein shakes, it may be worth reviewing whether whey protein is a trigger for you.

4. High-Sugar Foods

High-sugar foods often overlap with high-glycaemic foods, but they deserve their own mention because many people notice breakouts after periods of eating more sugar than usual. Sugar may contribute to acne by increasing blood sugar fluctuations, insulin demand and inflammatory load. This can be particularly relevant if you also experience energy crashes, cravings, mood swings or hormonal symptoms (Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). Examples include: This does not mean you need to fear sugar. But if acne flares after frequent high-sugar intake, your skin may be responding to blood sugar instability rather than sugar itself being the only issue.

5. Highly Processed Foods

Highly processed foods are not proven to directly cause acne in everyone, but diets high in ultra-processed foods are often lower in fibre, antioxidants, omega-3 fats, zinc and other nutrients that support skin health. Examples include: The issue is usually not one takeaway or one snack. It is the overall pattern. If processed foods regularly replace nutrient-dense meals, the body may have fewer resources to support hormone balance, gut health and skin repair.

6. Chocolate: Does It Really Cause Acne?

Chocolate has been blamed for acne for decades, but the evidence is mixed. The problem may not be cocoa itself. It may be the combination of sugar, dairy and refined ingredients found in many chocolate bars. Some people tolerate dark chocolate well, especially when it is lower in sugar. Others notice flare-ups after eating chocolate frequently. Again, the key is not fear. It is noticing your own patterns.

How to Identify Your Personal Acne Triggers

If you suspect food is triggering your acne, avoid cutting out lots of foods at once. This can make your diet unnecessarily restrictive and make it harder to identify what is actually affecting your skin. A better approach is to:

• Keep a food, skin and symptom diary for 2–4 weeks
• Track breakouts, digestion, stress, sleep and menstrual cycle changes
• Look for repeated patterns rather than one-off reactions
• Trial one change at a time, such as reducing high-glycaemic foods or removing dairy temporarily
• Reintroduce foods gradually to see whether symptoms return

A structured approach gives you better information than guessing.

Foods That May Support Clearer Skin

Instead of only focusing on what to avoid, it is helpful to think about what your skin needs more of. Skin-supportive foods may include: You can read more here: Foods for Hormonal Acne.

When Acne Is More Than a Food Issue

If your acne is persistent, painful, cystic or affecting your confidence, food may only be one part of the picture. Acne may also be linked with:

• Hormonal imbalances
• PCOS-related symptoms
• High stress levels
• Poor sleep
• Gut symptoms
• Constipation
• Nutrient deficiencies
• Inflammation

If your skin does not improve despite making sensible changes, it may be time to look deeper at what is driving your symptoms. For a wider guide, read: How to Get Rid of Acne. You may also find this article helpful: The Gut-Skin Axis: Why Your Skin Won’t Heal Until Your Gut Does. If acne appears alongside bloating, constipation, reflux, IBS-type symptoms or food sensitivities, you may also find Can Gut Health Cause Acne? helpful.

The Bottom Line

Foods that may trigger acne include high-glycaemic foods, high-sugar foods, dairy, whey protein and heavily processed foods. However, these foods do not affect everyone in the same way (Juhl et al., 2018; Baldwin and Tan, 2021; Meixiong and Bhutani, 2022). The most helpful approach is to identify your personal triggers while also supporting your skin with balanced meals, enough protein, fibre, healthy fats and key nutrients. Acne is rarely about one food alone. It is usually a sign that several internal factors need support.

What This Means For You

If you feel like your skin reacts to everything, the answer is not necessarily to cut out more foods. A more useful approach is to track patterns, support your skin with balanced meals, and look at the wider acne picture, including gut health, hormones, stress, sleep, blood sugar balance and nutrient status.