Jan 31, 2026

How Sugar Affects Acne Prone Skin

Why Sugar Can Influence Acne Development

1. Glycaemic Load & Blood Sugar Spikes

Consuming high amounts of sugar and high-glycaemic foods causes rapid increases in blood glucose. In response, the pancreas releases insulin to help shuttle glucose into cells. Repeated spikes in blood sugar lead to chronic hyperinsulinaemia (elevated insulin levels), which plays a central role in acne development.

High glycaemic diets are consistently linked with increased acne severity and lesion counts, as seen in systematic reviews and clinical research on diet and acne.

Insulin & IGF-1: Hormones That Drive Acne

Insulin-Like Growth Factor-1 (IGF-1)

Elevated insulin increases insulin-like growth factor-1 (IGF-1) — a hormone that stimulates many processes relevant to acne, including:

Sebum production (oil)
Sebocyte proliferation
Keratinocyte growth (dead skin cells)

These changes contribute to clogged pores and increased acne lesion formation.

IGF-1 also appears to interact with sex hormones like androgens, amplifying their effects on sebum production and skin inflammation.

Androgens and Sebaceous Gland Activity

Sugar-driven insulin pathways influence the body’s hormonal balance in ways that can exacerbate acne:

Insulin increases androgen production, including testosterone and DHEA. Higher androgen levels stimulate sebaceous glands to produce more sebum — a key factor in acne development.
Insulin also reduces sex hormone-binding globulin (SHBG), which normally limits free androgen levels. Lower SHBG means more active androgens in circulation, further driving sebum output.

This mechanism is relevant for both males and females, though hormonal acne patterns (e.g., chin/jawline breakouts in females) may vary due to other endocrine influences.

Chronic Inflammation

Sugar doesn’t just influence hormones — it can also trigger systemic inflammation, which worsens acne.

Key inflammatory pathways include:

Pro-inflammatory cytokines (signalling molecules) elevated by chronic high sugar intake
Oxidative stress caused by excessive glucose metabolism, which damages skin cells
Disruption of the gut microbiome, which can increase systemic inflammation and affect immune-skin interactions

These inflammatory processes can make acne more severe and persistent.

Sebum Overproduction and Pore Blockage

High insulin and IGF-1 levels stimulate:

Sebocyte proliferation (creating more oil cells)
Lipogenesis (fat/oil production within sebaceous glands)

More sebum means more opportunity for:

Dead skin cells to stick together
Pores to clog
Acne-causing bacteria like Cutibacterium acnes to thrive

This combination of hormonal signalling and oil production creates an ideal environment for breakouts.

Male vs Female Considerations

Females

Women may be more sensitive to hormonal fluctuations that influence acne, including menstrual cycle–related androgen shifts and insulin sensitivity.
Conditions like PCOS (polycystic ovary syndrome) feature insulin resistance and elevated androgens, linking sugar metabolism directly to acne severity.

Males

Higher baseline androgen levels can amplify the effects of insulin-driven sebum production.
Insulin resistance and increased IGF-1 can further boost sebaceous gland activity and inflammation.

Overall, while the basic mechanisms are similar, individual hormonal baselines can mean differences in acne presentation and severity.

Summary: How Sugar Affects Acne-Prone Skin

1. Blood Sugar & Insulin
Sugar causes rapid glucose spikes, increasing insulin and IGF-1, which stimulate sebum production and cell proliferation — key drivers of acne.

2. Androgen Activity
High insulin increases androgen synthesis and reduces SHBG, leading to more active hormones that stimulate oil glands.

3. Inflammation
Chronic sugar intake increases inflammatory markers, oxidative stress, and immune activation, all of which worsen acne.

4. Sebum Overproduction
Insulin and IGF-1 upregulate oil production and keratinocyte proliferation, creating clogged pores and acne formation.

Dietary & Lifestyle Takeaways

Research suggests that reducing high-glycaemic foods and refined sugar may help alleviate acne severity. A low-glycaemic diet has been linked with improvements in acne lesions and hormonal markers compared with high-sugar dietary patterns.

Consider focusing on whole foods, balanced blood sugar, and anti-inflammatory nutrients to support clearer skin.

Take a look at our Curated Acne Collection of Products chosen for results.

If you're looking to support your skin with advanced facial technology, explore my Microcurrent Facial Treatments at Julia Hart Electric Facialist, designed to strengthen skin function and encourage natural regeneration.