Benzo[a]pyrene, often abbreviated BaP, is everywhere in modern life. It forms whenever organic matter burns incompletely, which means it rises from charcoal grills as fat drips onto hot coals, drifts from cigarette smoke and tailpipes, and accumulates in workplaces such as aluminum smelters, coke ovens and asphalt plants. The International Agency for Research on Cancer classifies it as a Group 1 carcinogen, a category reserved for agents with confirmed cancer-causing activity in humans. Once ingested or inhaled, BaP is metabolically activated by cytochrome P450 enzymes, chiefly CYP1A1 and CYP1B1, into a highly reactive intermediate called BPDE. This compound latches onto DNA to form adducts that can initiate cancer, while the metabolic process itself generates a flood of reactive oxygen species that overwhelm the body’s natural antioxidant enzymes and damage cell membranes, proteins and lipids. Because the liver serves as the body’s principal detoxification organ, it bears the brunt of this chemical assault.

The research team, based at Islamic Azad University in Shahrekord, Iran, set out to test whether dietary intervention could blunt this damage. Seventy male C57BL/6 mice were randomly assigned to fourteen groups of five animals each, with the sample size determined by formal power analysis to satisfy the principles of reduction in animal research. One group received only standard food, another received the olive oil vehicle used to dissolve the chemicals, and a third received 20 milligrams per kilogram of BaP daily by oral gavage for four weeks, a dose previously shown to induce significant oxidative stress and liver and kidney injury in mice without reaching acute lethal levels. A fourth group received vitamin E at 250 milligrams per kilogram, a dose established in earlier studies as antigenotoxic against BaP damage. The remaining groups received chia seed powder mixed into their food at 10, 20 or 30 percent by weight, either alone, alongside BaP simultaneously, or as a two-week pre-treatment before BaP exposure began.

The design allowed the researchers to answer two distinct practical questions. Co-administration tested whether the protective agents could limit damage occurring at the same time as exposure, a scenario relevant to people who cannot avoid contaminated food or polluted workplaces. Pre-treatment tested whether building up the body’s defenses in advance could prevent injury more effectively, a scenario relevant to preventive nutrition. All biochemical analyses were performed in a blinded manner, and the animals were monitored daily for humane endpoints such as excessive weight loss or lethargy, none of which were reached during the study.

The results were unambiguous in one direction and humbling in another. BaP exposure significantly depleted the mice’s total antioxidant capacity and superoxide dismutase activity, raised malondialdehyde, a marker of lipid peroxidation, elevated the liver enzymes AST and ALT, lowered serum albumin, and pushed triglycerides and LDL cholesterol upward. Vitamin E, despite its reputation as a potent fat-soluble radical scavenger, failed to restore antioxidant capacity or superoxide dismutase activity and offered no meaningful protection to the liver enzymes. Chia seeds, by contrast, produced dose-dependent benefits. At 20 and 30 percent dietary inclusion, co-administered chia significantly raised total antioxidant capacity and superoxide dismutase activity while lowering malondialdehyde. Thirty percent chia pre-treatment increased both superoxide dismutase and glutathione peroxidase activities and cut malondialdehyde levels further. Chia co-administration reduced AST at all doses, rescued albumin at the lower doses, lowered triglycerides across the board, and raised protective HDL cholesterol at the higher doses.

The lipid findings were particularly dramatic. BaP exposure drove triglycerides from roughly 1.1 millimolar in controls to 2.44 millimolar, and LDL cholesterol from about 83 to 163 milligrams per deciliter. Chia co-administration at 30 percent brought triglycerides back near baseline while pushing HDL cholesterol to levels well above those of untreated controls. The authors attribute these effects to the seed’s unique biochemical portfolio: alpha-linolenic acid, abundant dietary fiber and a rich array of polyphenols. Mechanistically, chia-derived alpha-linolenic acid appears to activate peroxisome proliferator-activated receptor alpha, boosting fatty acid oxidation, while suppressing sterol regulatory element-binding protein-1, which curbs lipogenesis. Chia components also inhibit fatty acid translocase, known as CD36, limiting fatty acid uptake into tissues, and the seed’s proteins and polyphenols reduce inflammatory signaling through tumor necrosis factor alpha while raising adiponectin.

Why did the whole food outperform the purified vitamin? The researchers argue that BaP’s toxicity is multifaceted, attacking membranes, enzymes, lipid metabolism and DNA simultaneously, and that a single antioxidant molecule simply cannot cover all those fronts. Chia seeds deploy a multitarget strategy: their polyphenols and omega-3 fats act synergistically to neutralize reactive oxygen species directly, and they appear to activate the nuclear factor erythroid 2-related factor 2, or Nrf2, signaling pathway, which switches on the cell’s own antioxidant gene program. Vitamin E, by contrast, may influence CYP1A1 and CYP1B1 activity, but the study suggests this mechanism is insufficient against the scale of oxidative assault that BaP delivers. The authors also note that the vitamin E dose, though previously validated, may have been inadequate for this model, or that the four-week treatment window was too short.

Not every organ responded. BaP raised blood urea nitrogen and creatinine, classic markers of kidney injury, but neither chia nor vitamin E significantly reversed these changes. The researchers suggest that renal protection may require longer treatment durations or different therapeutic approaches, pointing to similar findings with lavender extract against lead-induced nephrotoxicity. The study also has acknowledged limitations: the diets were not isocaloric, body weight and food intake were not formally tracked, tissue-level analyses were not performed, and the potentially synergistic combination of chia and vitamin E was never tested, a question the authors flag as a priority for future work.

The pre-treatment versus co-administration comparison carries a clear public health message. Pre-treatment with 30 percent chia preserved superoxide dismutase and glutathione peroxidase activities and kept malondialdehyde low, suggesting that building antioxidant reserves before exposure is the more effective strategy. For the millions of people exposed to BaP through charred food, secondhand smoke or occupational settings such as coke ovens and aluminum plants, where air monitoring has identified BaP as the dominant carcinogenic risk, the implication is that preventive dietary supplementation matters more than trying to repair damage after the fact. The findings also align with a broader shift in nutrition science away from single-molecule supplements and toward whole-food matrices, whose complex mixtures of bioactive compounds often deliver benefits that isolated nutrients cannot replicate.

Cautious interpretation remains essential. These results come from mice receiving deliberately high doses of both toxin and protective agents, and human trials of chia supplementation in healthy and overweight adults have generally shown only modest changes in lipid profiles and inflammatory markers, likely because those studies lacked a specific toxic challenge. The authors emphasize that clinical and mechanistic studies in humans are needed before dietary recommendations can be made with confidence. Still, the study offers a compelling proof of concept that a common, inexpensive whole food can outperform a flagship antioxidant supplement against one of the world’s most notorious environmental carcinogens, and it suggests that what you eat before exposure may matter as much as the exposure itself.

Subject of Research: Dietary protection against benzo[a]pyrene-induced oxidative toxicity in mice using chia seeds and vitamin E

Article Title: Protective Effects of Chia Seeds and Vitamin E Against Benzo[a]Pyrene‐Induced Toxicity in Male Mice: A Comparison of co‐Administration and Pre‐Treatment Strategies

Article References: Rezaei, M., & Karimi‐Dehkordi, M. (2026). Protective Effects of Chia Seeds and Vitamin E Against Benzo[a]Pyrene‐Induced Toxicity in Male Mice: A Comparison of co‐Administration and Pre‐Treatment Strategies. Food Science & Nutrition, 14(10), Article e72405. https://doi.org/10.1002/fsn3.72405

Image Credits: AI Generated

DOI: 10.1002/fsn3.72405

Keywords: benzo[a]pyrene, chia seeds, vitamin E, oxidative stress, hepatotoxicity, polycyclic aromatic hydrocarbons, antioxidants, mice study, lipid profile, food toxicology, pre-treatment, nutrition

The research team, led by Aljawharah Alqathama of Umm Al-Qura University in Makkah and Rizwan Ahmad of Imam Abdulrahman Bin Faisal University in Dammam, Saudi Arabia, purchased eleven commercially available chia seed batches coded C1 through C11, representing origins that included Saudi Arabia, Ecuador, Bahrain, India, Argentina, Mexico, Peru (both yellow and brown varieties), Bolivia, the United States, and Spain. Rather than relying on harsh organic solvents, the team embraced green chemistry. They tested twelve solvent systems in an ultrasonic dismembrator probe, which uses cavitation bubbles to rupture plant cell walls and release their chemical cargo. The winning combination was acetone and water in a 70:30 ratio, which extracted roughly 168.4 parts per million of cumulative phenolics—about three times more than a 50:50 acetone-water mix and well above any ethanol-water blend.

The intermediate polarity of the acetone-water system proved ideal for simultaneously dissolving both moderately polar phenolic acids and more polar flavonoids, while ultrasonic cavitation enhanced mass transfer through the seed matrix. Using a fully validated UPLC-DAD method built on a C18 reverse-phase column with a formic acid mobile phase gradient, the researchers quantified five target phenolics: chlorogenic acid, rosmarinic acid, ferulic acid, quercetin, and kaempferol. Rosmarinic acid dominated at 385.77 ppm, followed by chlorogenic acid at 86.33 ppm and ferulic acid at 40.51 ppm, with kaempferol and quercetin present only in trace amounts. Geographical origin mattered enormously: seeds from the United States accumulated the highest total phenolics at 78.7 ppm, followed by Saudi Arabia at 69.2 ppm and Ecuador at 52.5 ppm.

With the chemistry mapped, the team turned to biology, screening every extract against five enzymes selected for their therapeutic relevance. Alpha-amylase, the carbohydrate-digesting enzyme targeted by the diabetes drug acarbose, was inhibited by 38 to 71 percent across origins in initial screening. The Indian origin sample, C4, proved the standout, achieving the lowest IC50 value of 104.4 micrograms per milliliter—remarkably close to acarbose’s own 78.82 micrograms per milliliter. Intriguingly, C4 did not have the highest total phenolic content. Instead, it carried elevated levels of ferulic acid and chlorogenic acid, both known competitive inhibitors of carbohydrate-digesting enzymes, suggesting that the composition of a seed’s phenolic cocktail matters more than its sheer quantity.

The cholinesterase results may be the most clinically provocative. Acetylcholinesterase inhibition ranged from 36 to 63 percent, with Mexican and American samples leading the field and posting IC50 values of 99.02 and 97.52 micrograms per milliliter respectively—both below the 100 micrograms per milliliter threshold the authors describe as having considerable therapeutic relevance. Butyrylcholinesterase inhibition was even more consistent, spanning 53 to 73 percent across all origins. The American sample C10 delivered the single strongest result of the entire study, an IC50 of 79.41 micrograms per milliliter against BChE. Because butyrylcholinesterase activity rises in the later stages of Alzheimer’s disease, dual cholinesterase inhibition is considered superior to targeting acetylcholinesterase alone, placing chia seeds in the same pharmacological neighborhood as rosemary and sage extracts rich in rosmarinic acid.

The American sample’s dominance extended to lipid metabolism. Pancreatic lipase, the enzyme targeted by the anti-obesity drug orlistat, was inhibited by 37 to 69 percent in preliminary screening, with C10 again posting the lowest IC50 at 90.82 micrograms per milliliter. Mexico and Spain followed closely. The authors attribute this activity to chlorogenic acid, rosmarinic acid, and quercetin, which are thought to block the catalytic serine residue of lipase and obstruct access to its hydrophobic binding pocket. The potency rivals previously reported values for green tea catechins and grape seed proanthocyanidins, positioning chia extracts as candidates for anti-obesity functional beverages and metabolic health supplements.

Tyrosinase, the copper-containing enzyme behind skin pigmentation and enzymatic browning in foods, told a different story. Here the Ecuadorian and yellow Peruvian samples shone, with inhibition of 67 and 66 percent and IC50 values of 88.81 and 95.41 micrograms per milliliter. The Ecuadorian sample’s high rosmarinic acid content of 42.70 ppm fits the known mechanism: phenolic acids chelate the copper ions at tyrosinase’s binuclear active site and compete with the L-DOPA substrate. Strikingly, the American sample that dominated every other assay failed to yield a measurable tyrosinase IC50, an inverse relationship the authors interpret as evidence that specific phenolic profiles confer selectivity toward particular enzymes rather than blanket inhibition.

To untangle these patterns, the team deployed a statistical arsenal of k-means clustering, one-way ANOVA with Tukey post-hoc tests, and principal component analysis. The clustering separated the eleven origins into distinct groups, with chlorogenic acid and quercetin emerging as powerful discriminators. ANOVA revealed that ferulic acid significantly influenced both alpha-amylase and tyrosinase inhibition, while chlorogenic acid showed a pronounced effect against acetylcholinesterase. Principal component analysis, interpreted cautiously as exploratory given the small dataset and low Kaiser-Meyer-Olkin value of 0.14, explained a cumulative 82 percent of variance across four components, with quercetin and rosmarinic acid loading strongly on the first component alongside a notable negative loading for acetylcholinesterase inhibition.

Why should geography shape a seed’s pharmacy so profoundly? The answer lies in plant secondary metabolism. Environmental variables such as soil composition, pH, irrigation, temperature, radiation, and altitude all feed into the phenylpropanoid pathway that manufactures phenolic compounds. Abiotic stresses, including water scarcity and elevated ultraviolet exposure, can stimulate this pathway as part of the plant’s defense arsenal, boosting phenolic accumulation. Post-harvest handling, particularly drying methods, can further degrade or preserve these fragile molecules. The result is that two genetically similar chia seeds, grown on different continents, can carry measurably different chemical fingerprints and, by extension, different biological activities.

The study’s implications ripple outward in several directions. For the functional food and nutraceutical industries, it suggests that origin-specific sourcing could become a quality control strategy: American chia for neuroprotective and anti-obesity formulations, Indian chia for glycemic control, Ecuadorian chia for cosmeceutical applications. The authors caution, however, that the chemometric trends are preliminary and that the multivariate modeling was constrained by the small sample size and incomplete IC50 coverage. They call for broader geographic sampling, molecular docking and enzyme kinetics studies to confirm binding specificity, investigation of the seed’s lipid fraction, and ultimately in vivo studies and clinical trials to translate these in vitro signals into therapeutic reality. Until then, the findings add a compelling new dimension to the chia story: the seed’s celebrated health benefits may be written not just in its genes, but in the soil, sun, and stress of the places where it grows.

Subject of Research: Origin-dependent phenolic profiling and multi-target enzyme inhibition of chia seed extracts

Article Title: Antidiabetic, antihyperlipidemic, and anticholinesterase enzymes inhibitory potential of green-extracted and UPLC-DAD-quantified chia (Salvia hispanica, Lamiaceae) seed phenolic compounds

Article References: Alqathama, A., & Ahmad, R. (2026). Antidiabetic, antihyperlipidemic, and anticholinesterase enzymes inhibitory potential of green-extracted and UPLC-DAD-quantified chia (Salvia hispanica, Lamiaceae) seed phenolic compounds. Plant Biosystems, 160(5), Article 251. https://doi.org/10.1007/s44473-026-00260-z

Image Credits: AI Generated

DOI: 10.1007/s44473-026-00260-z

Keywords: chia seeds, phenolic compounds, enzyme inhibition, alpha-amylase, cholinesterase, lipase, tyrosinase, UPLC-DAD, green extraction, chemometrics, functional foods, Alzheimer's disease