Shroom Scan #112: Psilocybin hits women differently, maitake boosts chemo, and oyster mushrooms cut methane 60%

Hi Shroomers. It’s Texas Mushroom Conference weekend! I’ll be at the films on Saturday and the conference on Sunday. If you see me, say hi!

Chemo gut protection 🛡 Enoki mushroom (Flammulina velutipes) reduced chemotherapy-related gut damage in mice given 5-FU, improving diarrhea and restoring colon length from 2.8 inches to 3.9 inches at higher doses. It lowered inflammation signals, reduced oxidative damage, and restored gut cell regrowth needed to repair the lining, helping to protect digestion and maintain gut strength during chemotherapy.

Chemo boost effect 💥 Maitake mushroom (Grifola frondosa) extract triggered cancer cell death at doses of ~0.004–0.01 oz per cup, with stronger effects over 24–48 hours. When combined with chemotherapy drugs like cisplatin and taxol, it significantly increased cancer cell death compared to either drug alone and further disrupted tumor structure in 3D models. This suggests it can make standard cancer treatments work more effectively, potentially allowing for lower drug doses with the same impact.

Fungi–bacteria balance 🧫 Gut fungi and bacteria shift together in IBS and IBD, with disease status explaining ~4–9% of microbiome differences and fungal changes often stronger in inflammatory conditions like ulcerative colitis and Crohn’s. People with IBS showed higher bacterial diversity, while IBD cases had more fungal imbalance, including overgrowth of fungi like Candida and loss of beneficial, short-chain fatty acid–producing microbes. A common gut microbe, Blastocystis, appeared in ~48% of people and was linked to higher levels of beneficial bacteria that support digestion, showing fungi can actively reshape gut health, not just reflect it.

Immune markers rebound 🧪 Shiitake mushroom (Lentinula edodes) enriched with zinc and selenium improved key immune and recovery markers in 120 tuberculosis patients, increasing hemoglobin and sharply reducing inflammation over 30 days. Patients receiving the fortified doses (10–20 mg zinc and 10–20 μg selenium per serving) also showed gains in BMI, weight, and faster infection clearance. These effects are driven by zinc activating immune cells and selenium boosting antioxidant enzymes, helping the body control infection and recover more efficiently.

End-of-life anxiety drop 🕯 Psilocybin reduced death anxiety in terminal patients with effect sizes ranging from −0.70 to −1.08, with benefits lasting up to 6 months after a single dose. It works by activating 5-HT2A receptors and disrupting rigid brain networks tied to fear and self-focus, allowing shifts in perception and meaning.

Belief flexibility reset 🪜 Psilocybin weakens rigid negative beliefs through the REBUS model, allowing new mental patterns to form by increasing brain plasticity and glutamate signaling via 5-HT2A activation. It drives measurable increases in synaptic density and neural rewiring in depression-related brain regions, even in some cases when 5-HT2A is blocked. This shift in thinking patterns helps break entrenched loops like rumination, enabling emotional reset and improved mental flexibility.

Sex-specific brain response ⚡ Psilocin (2 mg/kg) increased emotional brain activity in females but not males, nearly doubling activation in key stress-processing regions. It heightened reactivity to stress for up to 2 days in females, while males showed little to no increase or even reduced signaling over time. These differences suggest treatment effects may vary significantly by sex, impacting how psilocybin therapies are dosed and applied.

Plastic breakdown boost 🧃 Fungal–bacterial combinations increased plastic mulch degradation, with Aspergillus-based treatments driving up to 3.71% weight loss in polyethylene and ~4.9% in compost conditions, alongside clear chemical changes. UV pre-treatment and mineral oil further accelerated breakdown by improving microbial attachment and oxidation, especially for stubborn plastics. These results show that pairing fungi and bacteria can meaningfully speed up agricultural plastic decay, though even enhanced degradation remains relatively slow for conventional plastics.

Heavy metal removal spike ⚙️ Fungi (Aspergillus sp. + Penicillium sp.) immobilized on biochar removed 83.65% of manganese from highly acidic water (pH 3.0) starting at 50 mg/L within 7 days, outperforming free-floating fungi and starting cleanup 2 days earlier. The system worked by shifting fungal metabolism to raise pH and trap metals through adsorption, precipitation, and accumulation in cell walls, enabling reliable cleanup of toxic wastewater in extreme conditions where standard treatments fail.

Microplastic ecosystem risk 🌲 Microplastics (<5 mm) are now reaching forest soils at levels comparable to cities and farmland, with deposition rates up to 300 particles per m² per day and accumulation of thousands of particles per kg of soil. They disrupt fungal systems by increasing oxidative stress, altering growth, and shifting communities toward stress-tolerant and pathogenic species while reducing key decomposers. This can slow decomposition and nutrient cycling, weakening forest health and carbon storage over time.

Soil nutrient upgrade 🌱 Selenium-enriched mushroom waste (spent substrate) increased soil selenium availability by converting it into more plant-usable forms, while boosting beneficial microbial activity and diversity. Composting outperformed simple stacking by driving stronger organic matter breakdown and more stable nutrient transformation, improving soil fertility and nutrient uptake, turning mushroom waste into a more effective agricultural input.

Low-impact protein shift 🍗 Mushrooms deliver 19–35% protein (dry weight) with complete essential amino acids and 60–80% digestibility, rivaling many animal proteins while avoiding common plant protein limitations like antinutrients. Production uses 85–90% less water and land and generates ~80% fewer greenhouse gas emissions than livestock, while also upcycling agricultural waste into food. Their natural fiber structure, umami compounds, and bioactives (β-glucans, ergothioneine) make them highly functional in meat analogs, snacks, and beverages without heavy processing. Lesson: eat your mushrooms! Be the change!

Methane cut, digestion up 🐮 Adding oyster mushroom (Pleurotus spp.) spent substrate to feed increased digestibility by 29–37% while keeping fermentation stable, meaning animals extracted more usable energy from the same feed. Methane emissions dropped sharply by 35–60%, alongside 17–49% lower CO₂, driven by shifts toward more efficient fermentation pathways so agricultural waste became a high-impact feed upgrade that improved efficiency and meaningfully reduced livestock emissions.

Better-for-you baking 🍰 Oyster mushroom (Pleurotus ostreatus) powder at 12% substitution increased protein from 6.5 to 8%, fiber from 3% to 4%, and minerals (ash) from 1.16% to 1.88%, while lowering carbohydrates from 58% to 55%. Sensory scores peaked at 8.31/9 overall acceptability, with improvements in texture, taste, and softness as mushroom levels increased, making a standard cake into a higher-protein, higher-fiber mushroom cake that tastes even better.