Acne is a messenger

Internal stress shows up on the skin and tells a story of our internal system's imbalance

Oct 19, 2025

Acne vulgaris is one of the most common chronic inflammatory conditions, yet it’s rarely treated as the systemic disorder it is. Beneath surface inflammation lies a complex interaction and imbalance between metabolism, hormones, immunity, and the microbiome.

Our skin directly reflects how our internal systems are managing nutrients, stress, and inflammation. When the skin becomes congested or inflamed, it’s often echoing disturbances happening deeper with glucose regulation, oxidative stress, or microbial imbalance.

Modern research increasingly links acne to insulin resistance, dietary patterns, and altered gut-skin communication. Pathways once associated mainly with diabetes and obesity are now recognized as key regulators of sebaceous gland activity and immune signaling in the skin. This makes acne not just a dermatologic condition but an early marker of metabolic stress.

Understanding acne through an integrative lens reframes it as a visible sign of systemic imbalance and one that responds best when we restore rhythm internally and reinforce the skin barrier externally.

Acne as a disease

Acne is a chronic inflammatory disease of the pilosebaceous unit characterized by hyper-keratinization, overproduction of sebum, skin microbiome dysbiosis, and the activation of our immune system. Androgens that regulate growth, like testosterone and DHEA, stimulate the sebaceous glands to produce more oil, changing their makeup to include more squalene and wax esters (fats that oxidize easily).

When squalene oxidizes into squalene peroxide, it becomes highly inflammatory, damaging the follicle wall and fueling acne-causing bacteria. In short, excess androgens make skin oilier, and the oil itself is more reactive and irritating.

This in turn fuels reactive oxygen species (ROS) and pro-inflammatory cytokines like IL-1β, IL-6, and TNF-α, which are chemical messengers from our macrophage cells. The result is follicle obstruction, rupture, and inflammation.

High-glycemic diets and dairy intake stimulate insulin and IGF-1, which in turn activate the body’s internal ‘growth switch’ (mTORC1) that tells cells to build, store, and secrete. When mTORC1 is stuck in the ‘on’ position, sebaceous glands go into overdrive, and keratinocytes inside the follicle multiply faster than they should. This same pathway suppresses a transcription factor (Fox01) that keeps antioxidant defenses and normal cell turnover in balance.

To exacerbate this process, when Fox01 is downregulated, the skin loses part of its antioxidant shield. ROS accumulates, which damages nearby lipids and proteins, and the skin’s antioxidant systems can’t keep up. Once ROS accumulate, they further oxidize sebum and activate signaling for cytokine release, and drive even more mTORC1 activity, turning acne into a self-reinforcing inflammatory loop. Over time, this inflammatory cascade amplifies IL-17, the immune signal that deepens redness, swelling, and sensitivity in active lesions.

It always comes back to the gut

Research shows that people with acne often have fewer beneficial species in the gut microbiome, like Bifidobacterium and Lactobacillus, and more inflammatory families such as Proteobacteria and Bacteroidetes.

Read more on the link between gut health and chronic inflammation.

Short-chain fatty acids (SCFAs) such as butyrate and propionate, normally produced by bacterial fermentation of dietary fiber, are critical regulators of gut barrier integrity and glucose homeostasis. A reduction in these fatty acid-producing species (that feed on foods like onions, garlic, carrots, pears, and Jerusalem artichoke) contributes to insulin dysregulation and increases inflammation.

Rebalancing the gut microbiome through diet or targeted prebiotic and polyphenol interventions may therefore improve both metabolic and dermatologic outcomes. Green tea polyphenols, particularly EGCG, have demonstrated direct benefits in acne, reducing inflammatory lesions and sebum production through antioxidant and anti-androgenic effects.

Read more about the benefits of EGCG to our immune system balance.

These shifts mirror the patterns also seen in metabolic syndrome, suggesting shared roots. The same metabolic imbalances that drive insulin resistance and inflammation in metabolic syndrome (oxidative stress, gut dysbiosis, and chronic, low-grade inflammation) are mirrored in acne. In that sense, acne is a visible sign from the metabolic system that something deeper may be out of rhythm.

Our skin microbiome

Our skin barrier mirrors the gut barrier in structure and function, and both rely on lipid integrity, tight-junction proteins, and microbial balance to maintain balance. Clients with acne often exhibit increased skin moisture loss, elevated skin pH, and decreased microbial diversity, indicating barrier compromise.

Loss of filaggrin, a protein that stacks and binds skin cells together like mortar between bricks, weakens cohesion and hydration in the outer layer. Reduced claudin-1, one of the microscopic ‘zippers’ sealing neighboring cells, and desmoglein-1, a structure ‘rivet’ anchoring them for strength, further undermines barrier integrity. When these proteins decline, moisture escapes and irritants can penetrate, priming the skin for inflammation.

Repairing the skin barrier, therefore, becomes a therapeutic priority alongside regulating systemic metabolic drivers.

Read more on the importance of our microbiome network.

Integrative support for treatment

The integrative management of acne combines internal metabolic rebalancing with topical barrier restoration. From an internal perspective, the goal is to quiet mTORC1 and IGF-1 signaling while restoring microbial balance and insulin sensitivity. This may be achieved through:

A low-glycemic, anti-inflammatory diet that emphasizes a roughly 45% protein, 35% complex carbohydrate, 20% unsaturated fat balance.
Reduction (or even elimination) of dairy and refined carbohydrates since dairy contains IGF-1 and androgen precursors that amplify sebaceous activity. High sugar intake overstimulates insulin and mTORC1, worsening oil production.
Eliminate trans- and saturated fat, as these increase inflammatory messages and thicken sebum.
Increase omega-3 fatty acids (EPA + DHA) because they have been shown to stabilize the skin barrier by reducing IL-1β and IL-17 signaling.
Ensure intake of nutrients like vitamin C and E, selenium, and polyphenols from green tea or berries to counter oxidative stress through an increase in antioxidants.

External treatment for acne that shows the greatest effect is vitamin A derivatives like retinol, which remain the gold standard for normalizing and enhancing skin turnover. However, the most effective approach that clears skin and restores the terrain within blends metabolic recalibration (diet, micronutrients, gut support) with barrier restoration (topical vitamin A).

Closing thoughts

When viewed through an integrative lens, acne vulgaris becomes a signal of internal metabolic discord rather than merely a surface defect. Addressing both diet and barrier health allows practitioners to modulate the shared pathways linking acne, dysbiosis, and metabolic dysfunction.

The Metabolic Health Edit

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