Should the Future of Root Cause Medicine Include Engineered Food? This Might Make You Think
How ceramides influence skin barrier function, cardiometabolic health, and longevity.
Ceramides: What clinicians need to know
Most likely you know about ceramides for skin health. Interestingly, ceramides are also emerging biomarkers of metabolic health, caught up in the crosshairs as chronic inflammation promotes the formation of dysfunctional ceramide types, which then participate in furthering inflammatory processes. However, patients should not avoid ceramide-containing foods as these dietary sources can help restore balance. While many questions remain, several practical takeaways are already clear:
- Supporting skin barrier health with topical (and dietary!) ceramides remains important.
- Ceramide-containing foods should not be avoided. Harmful ceramides (like C16:0) are primarily produced endogenously during metabolic dysfunction (ie, high insulin and blood sugar stimulate ceramide synthesis, much like they stimulate triglyceride production).
- Promote Mediterranean-style, plant-rich dietary patterns to support healthy ceramide metabolism.
- Prioritize polyphenols, fiber, and unsaturated fats, which may help lower dysfunctional circulating ceramide species.
- Limit excess refined carbohydrates, saturated fat (particularly palmitate, especially when combined with refined carbohydrates), and overall metabolic overload, which drive dysregulated de novo ceramide synthesis.
- Interpret plasma ceramides as evolving biomarkers of metabolic health, with nuance according to chain length, not simply “good” or “bad” molecules.
Ceramides are increasingly discussed in both dermatology and cardiometabolic medicine (with relevance for the myriad conditions linked to metabolic dysfunction), yet the clinical messaging can seem contradictory. In the skin, ceramides help maintain barrier integrity. In circulation, specific ceramide species are now incorporated into cardiovascular risk scores (CERT and CERAM) and are emerging as clinically relevant biomarkers of cardiometabolic health.
So are ceramides protective, pathogenic, or both? Current evidence suggests the answer depends on context. Ceramides are not inherently “good” or “bad”; their effects depend on maintaining the right ceramide species, in the right tissues, and in the appropriate metabolic context. Perhaps most surprisingly, dietary ceramide precursors often appear to exert effects opposite to those of the harmful ceramides generated during metabolic dysfunction. This article teases out the latest science and how clinicians can think through the clinical implications.
Ceramides in 60 seconds
What are ceramides? Ceramides are bioactive lipids that serve two major functions:
- Structural lipids, helping maintain the skin barrier and cell membrane integrity.
- Signaling molecules, regulating inflammation, metabolism, cellular stress responses, apoptosis, senescence, and immune function.
Whether ceramides promote health or disease depends on three factors: where they are found, which ceramide species are present, and how they are produced. The ceramides linked to chronic disease arise primarily from endogenous synthesis during metabolic dysfunction, not from eating ceramide-containing foods.
Image source: Cingolani F, Futerman AH, Casas J. Ceramide synthases in biomedical research. Chem Phys Lipids. 2016 May;197:25-32. doi:10.1016/j.chemphyslip.2015.07.026. Epub 2015 Aug 3. PMID: 26248326.
Hundreds of ceramide species exist, and individual species can have distinct, and sometimes opposing, biological effects.
Dietary Ceramides and Skin Barrier Function
Ceramides account for roughly half of the lipids in the stratum corneum, the outermost layer of the skin, where they form the “mortar” between skin cells. This lipid matrix locks in moisture, regulates skin pH, and limits transepidermal water loss (TEWL) while protecting against the penetration of allergens, irritants, and microorganisms.
Image source: Liu, Z., Qin, X., Wang, X., Zhang, J. and Yang, B. (2025), Mechanisms and Repair of Skin Barrier Dysfunction: The TLC Strategy. Int J Dermatol, 64: 23-32. https://doi.org/10.1111/ijd.70081
Ceramides, found in the epidermal layer, play a key role in skin barrier integrity which helps keep moisture in, repel antigens, toxins, UV light, and microbes. It’s fascinating we can both apply and ingest ceramides to support skin health.
This barrier function is particularly relevant in atopic dermatitis (AD), where both reduced ceramide levels and altered ceramide composition have been consistently observed, even in visually normal skin before lesions develop. Increasing evidence suggests that ceramide deficiency may therefore predispose to disease rather than simply result from inflammation. The relationship appears bidirectional: the Th2 cytokines IL-4 and IL-13, which drive allergic inflammation, suppress the enzymes responsible for ceramide synthesis, further weakening the skin barrier and perpetuating inflammation. Conversely, certain ceramide derivatives have been shown to inhibit IL-4 production, suggesting that ceramides may influence not only barrier integrity but also immune regulation.
Because epithelial barrier dysfunction is thought to contribute to allergic sensitization and the progression of the “atopic march” (eczema, food allergy, allergic rhinitis, and asthma), researchers have investigated whether restoring ceramides could influence more than skin hydration alone.
Supplementation with plant-derived ceramides (phytoceramides) extracted from rice bran, maize, pineapple, and konjac has improved skin hydration and reduced TEWL in randomized controlled trials. Although dietary ceramides make only a modest contribution to total ceramide pools, they appear to be biologically active, supporting skin barrier function through both direct replenishment and stimulation of endogenous ceramide synthesis. More intriguingly, in children with moderate atopic dermatitis and house dust mite allergy, oral konjac-derived ceramides reduced allergen-specific IgE production, suppressed the Th2 cytokines IL-4 and IL-13 and increased the Th1 cytokines IFN-γ and IL-12. The study also noted improvements in skin symptoms and reduced allergic responses. Together, these findings suggest that dietary ceramides may support both epithelial barrier integrity and immune tolerance in allergic disease, although larger clinical trials are needed to determine whether these benefits extend to other Th2-mediated conditions, such as allergic rhinitis and asthma.
Rice Ceramides: More Than a Skincare Ingredient? Rice-derived ceramides, including glucosylceramides and elasticamides found in rice bran, are among the most widely studied dietary ceramides. Unlike topical ceramide creams, oral ceramides may help support the body’s own ceramide production and skin barrier function from within. In one clinical study, oral rice ceramides improved several markers of skin health, including reduced transepidermal water loss (TEWL), improved skin hydration and sebum production, and improvements in skin texture, wrinkles, and elasticity. Together, these findings suggest that dietary ceramides may help strengthen barrier integrity while supporting overall skin appearance and function. Could regular consumption of ceramide-rich foods such as rice contribute to these effects? While this remains speculative, it highlights the emerging connection between diet and skin barrier physiology.
While restoring ceramides appears beneficial in tissues where they are deficient, their role is nuanced (and sometimes dramatically different) in metabolically active tissues. Here, excessive accumulation of certain types of ceramides is increasingly recognized as both a marker and potential mediator of metabolic dysfunction, cardiovascular disease, and aging.
Ceramides, Inflammation & Metabolic Disease
Excess circulating levels of certain endogenously produced ceramide species are increasingly recognized as biomarkers, and potentially mediators, of cardiometabolic disease, fatty liver disease, neurodegeneration and immune dysfunction. This does not mean that all ceramides are harmful, as we’ll see later in this article. At the same time, our understanding of ceramide biology is still evolving. Rather than acting as universally “good” or “bad” molecules, ceramides exert highly species-, tissue-, and context-dependent effects that researchers are beginning to fully unravel.
Image source: Wang S, Jin Z, Wu B, Morris AJ, Deng P. Role of dietary and nutritional interventions in ceramide-associated diseases. J Lipid Res. 2024;66(1):100726. doi:10.1016/j.jlr.2024.100726
In the context of obesity and metabolic disease, evidence suggests that chronic inflammation and endogenous ceramide dysregulation reinforce one another in a self-perpetuating cycle. Inflammatory molecules stimulate ceramide synthesis, while the accumulation of specific ceramide species further amplifies inflammatory signaling and impairs insulin sensitivity. Although this feedback loop is best characterized in adipose tissue, it illustrates an important principle: the impact of ceramidesis shaped not only by how much is present, but also by where it accumulates and which ceramide species predominate.
Within the liver, ceramides contribute to the progression of metabolic dysfunction-associated steatotic liver disease (formerly NAFLD). Here again, ceramide species matter: long-chain C16:0 ceramides generally promote lipotoxicity, whereas ultra-long-chain ceramides appear to protect hepatocytes from palmitate-induced injury.
In the gastrointestinal tract, dysregulated ceramide metabolism may impair epithelial barrier integrity while altering immune responses. Experimental studies suggest that both excessive and insufficient ceramide signaling can worsen colitis, depending on the cell type and ceramide species involved, highlighting ceramide metabolism as an emerging therapeutic target.
Within the brain, elevated ceramide levels have been associated with neuroinflammation, neuronal apoptosis, amyloid plaque formation and Alzheimer’s disease progression. Higher circulating C22:0 and C24:0 ceramides predict hippocampal volume loss, while elevated C16:0 and C24:0 species have been linked to increased risk of all-cause dementia in women, independent of age.
Cancer illustrates another important principle of ceramide function: the same molecule can exert opposite effects depending on context. Specific ceramide species, such as C18:0, promote apoptosis and may enhance anti-tumor immunity, whereas others, including C16:0, have been linked to tumor survival and proliferation in certain cancers. Likewise, increasing ceramide levels within myeloid cells protects against experimental colitis by limiting neutrophil migration, further illustrating that ceramide biology cannot be reduced to “high is bad.”
Are Ceramides an Emerging Hallmark of Aging?
Ceramides don’t simply accumulate with age. They appear to regulate many of the biological processes that underlie aging itself. Beyond their structural and signaling roles, ceramides influence cellular senescence, apoptosis, autophagy, mitochondrial function, and inflammatory signaling, prompting researchers to investigate whether they may represent an emerging hallmark of aging.
Remarkably, some of the first longevity genes identified in yeast (LAG1 and LAC1) were later found to encode enzymes involved in ceramide synthesis. Since then, studies in worms, mice, and humans have continued to strengthen the link between ceramide metabolism and longevity. In C. elegans, different ceramide synthase enzymes influence lifespan in opposite directions. Likewise, variants in the human ceramide synthase 1 (CERS1) gene (also known as LASS1) have been associated with exceptional longevity.
Animal studies further support this connection. Ceramide levels in circulation and various tissues tend to increase with age, whereas long-lived growth hormone-deficient mice exhibit lower ceramide concentrations. In addition, pharmacological inhibition of ceramide synthesis with compounds such as rapamycin and myriocin has been shown to extend lifespan in experimental models, although these findings have yet to be translated to humans.
Human studies are largely observational but compelling. Elevated circulating ceramides have been associated with cardiovascular disease, insulin resistance, cognitive decline, and other age-related conditions. Certain ceramide species, particularly C16:0 and C18:0, independently predict all-cause mortality in adults over 85 years of age and, in some cohorts, outperform LDL cholesterol as predictors of future mortality and cardiovascular events.
Interestingly, lipidomic analyses of healthy centenarians suggest that exceptional longevity is associated with a distinct sphingolipid profile rather than simply lower ceramide levels. Centenarians exhibit lower levels of ceramides generated via the de novo pathway together with higher concentrations of structural glycosphingolipids, such as hexosylceramides and gangliosides. This finding further supports the concept that healthy aging may depend on maintaining a favorable balance between structural and signaling sphingolipids, rather than minimizing all ceramides indiscriminately.
However, most of the evidence remains associative or preclinical. Rather than causing aging outright, ceramides may represent a readout of cumulative metabolic stress, reflecting nutrient excess, mitochondrial dysfunction, inflammation, and impaired lipid metabolism. If this hypothesis proves correct, ceramides may represent more than biomarkers of aging, they may become modifiable factors of biological aging itself.
Can Diet Influence Ceramide Metabolism?
One of the biggest surprises to emerge from ceramide research is that the foods containing ceramide precursors are not the foods most strongly associated with dysfunctional circulating ceramides. Instead, current evidence suggests that excessive endogenous ceramide production, driven by metabolic dysfunction, is far more important than dietary ceramide intake itself.
A significant nutritional driver of problematic circulating ceramides is excessive de novo ceramide synthesis. This pathway is fueled by palmitate, the primary fatty acid substrate for ceramide production, which can arise both from dietary saturated fat and from de novo lipogenesis, the metabolic pathway stimulated by chronic excess refined carbohydrate and fructose intake. For clinicians, this shifts the focus from avoiding ceramide-containing foods to identifying and treating the metabolic conditions that drive excessive endogenous ceramide production.
Conversely, dietary patterns that improve metabolic health consistently reduce circulating concentrations of the ceramide species most strongly associated with chronic disease. For instance, greater adherence to the Mediterranean diet is consistently associated with lower circulating C16:0, C18:0 and C24:0 ceramides. Similar reductions have been reported with plant-forward isocaloric Nordic diets, vegetarian diets, and fruit- and vegetable-rich dietary patterns, suggesting that diverse healthy eating patterns converge on improving ceramide metabolism.
These benefits likely reflect the combined actions of several key nutrients. Unsaturated fats from olive oil, walnuts, and fatty fish appear to reduce endogenous ceramides in part by competing with palmitate and by shifting sphingolipid metabolism toward less harmful pathways. Fiber supports ceramide metabolism through favorable effects on the gut microbiome and ceramide biosynthesis gene expression.
Polyphenols appear particularly intriguing. Anthocyanin-rich foods have been shown to reduce circulating C16:0 and C24:0 ceramides while downregulating genes involved in ceramide synthesis, providing one possible explanation for why polyphenol-rich dietary patterns, including the Mediterranean diet and Dr. Fitzgerald’s Younger You protocol, consistently improve overall health and longevity. Given that polyphenols are powerful epigenetic modulators, it is plausible that some of their benefits are mediated, at least in part, through favorable effects on ceramide metabolism.
Caloric restriction is another beneficial intervention for balancing ceramide metabolism. By improving mitochondrial function and reducing oxidative stress, calorie restriction has been shown to lower skeletal muscle ceramide content and suppress de novo ceramide synthesis.
Image source: Wang S, Jin Z, Wu B, Morris AJ, Deng P. Role of dietary and nutritional interventions in ceramide-associated diseases. J Lipid Res. 2024;66(1):100726. doi:10.1016/j.jlr.2024.100726
Although we often refer to “dietary ceramides,” most foods actually contain complex sphingolipids such as sphingomyelin from animal foods and glucosylceramides from plants. During digestion these are converted into ceramides and sphingoid bases that can influence host sphingolipid metabolism.
Experimental studies suggest dietary sphingolipids improve intestinal mucus barrier function, reduce circulating lipopolysaccharide (LPS), increase beneficial bacteria such as Bifidobacterium and reduce Gram-negative bacteria. In animal models of obesity, dietary sphingolipids also improved insulin sensitivity, reduced adiposity and hepatic lipid accumulation, and lowered inflammatory markers. Collectively, these findings reinforce that dietary sphingolipids behave very differently from the endogenous ceramides generated during metabolic dysfunction.
Taken together, current evidence suggests that ceramide metabolism is influenced far less by dietary ceramide intake than by the metabolic environment created by long-term dietary habits. For clinicians, the goal is therefore not to eliminate ceramide-containing foods, but to reduce the metabolic conditions that promote excessive endogenous ceramide production through dietary patterns rich in unsaturated fats, fiber, and polyphenol-containing plant foods while limiting metabolic overload from excess saturated fat and refined carbohydrates.
Curious fact: Higher dietary intake of DHA and potassium correlates with lower plasma levels of dysfunction-promoting ceramides.
The Bottom Line on Ceramides
Ceramides remind us that physiology is rarely black and white. Throughout this article we’ve seen the same family of lipids behave in remarkably different ways depending on where they are found, how they are produced, and which ceramide species are involved.
In the skin and epithelial barriers, ceramides are indispensable structural molecules. In contrast, chronic accumulation of specific endogenously produced ceramide species in metabolically active tissues is increasingly linked to inflammation, insulin resistance, and cardiometabolic disease. Perhaps most surprising of all, dietary sphingolipids often appear to support, rather than impair, healthy ceramide metabolism.
While many questions remain, the clinical implications are already becoming clearer. Rather than eliminating ceramides, clinicians should focus on restoring the metabolic environment that favors healthy ceramide balance through dietary patterns rich in fiber, polyphenols, unsaturated fats and whole plant foods, while limiting the metabolic overload that drives excessive de novo ceramide synthesis.
In many ways, ceramides exemplify one of the central themes of functional medicine and longevity science: the goal is not to eliminate a molecule, but to restore the biological context in which it functions optimally. In the end, the question isn’t whether ceramides are good or bad. It’s whether they’re in the right place, at the right time, and in the right balance. With the right inputs, we can trust our bodies to create the appropriate ceramide quantity and composition.
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