The Presence of Micro- and Nanoplastics in Food and the Estimation of the Amount Consumed Depending on Dietary Patterns (ovovegetarians have highest MNP intakes)

#1

The lacto-ovo-vegetarian diet was found to result in the highest MNP intake (69.1 × 106 particles/day), almost doubling that of the other tested patterns. This is mainly due to the very high proportion of fruit, vegetables, legumes, and nuts in daily meals

#2

The 2025 review finding that vegetarians have the highest MNP intake isn’t because nuts are a high-MNP food category per se — it’s because vegetarians consume high total mass of plant foods, and those plant foods include very-high-p/g produce. If you take that same vegetarian and GLP-1-compress their diet toward calorie density, you’re moving them down the MNP-per-calorie gradient, not across it or up it.

Redo of the table with the sign fixed:

Scenario Mass Δ MNP Δ Systemic saved/yr
-25% cal, proportional mass -25% -25% ~6 × 10⁷
-25% cal, displacement to nuts/oils (same cal, less mass) -40 to -55% -40 to -70% ~10⁸ to 1.7 × 10⁸
-40% cal + displacement (typical GLP-1 pattern in heavy produce eaters) -60% or more -60 to -80% ~1.5 × 10⁸ to 2 × 10⁸

So the “nuts replace produce” scenario is the best-case for MNP reduction, not the worst. My previous answer had the logic inverted. The worst case is actually “caloric reduction hits grains/legumes but produce stays flat” — which preserves most of the MNP load.

For someone already on a high-MUFA baseline, the headroom for further displacement is smaller than for a standard-American starting point, but the direction still favors further savings rather than plateauing.

Uncertainty I should still flag: I don’t have direct p/g measurements of almonds. The 10⁴-10⁵ estimate is extrapolated from the 2025 review grouping them with plant foods generally and from the Almond Cow blog mentioning packaging/shelling contamination. Could be off by an order of magnitude in either direction. If it turned out almonds are ~10⁶ p/g (implausible but not impossible if packaging dominates), the per-calorie advantage narrows.

Residual epistemic state: reasonably confident that per-satiety MNP favors nuts over produce, less confident on the exact magnitudes. The glass-syringe injection is still a rounding error against any of these food-side numbers.

#3

It’s a model, not a measurement. They took typical European dietary patterns (Mediterranean, Western, lacto-ovo-vegetarian), combined them with literature p/g values for each food category, and summed. The headline number is constructed, not observed in humans.

Why the vegetarian pattern comes out highest:

  • Produce dominates the sum. Apples/carrots at Conte-range concentrations (~10⁵ p/g) × 500-700g/day of produce = enormous numbers. Western diets have lower produce mass.
  • It’s lacto-ovo, not vegan. Packaged milk contained PES, PET, PTFE, Nylon 6, PU, PP, PAM, PS, PE, EVA, and PVA from dairy industry equipment and packaging PubMed Central. Dairy is a non-trivial contributor in this model.
  • Legumes and nuts add on top.
  • Mediterranean diet: 37.5 × 10⁶ particles/day PubMed Central — also plant-heavy, also olive-oil-heavy, but lower than lacto-ovo-vegetarian. The composition difference (less dairy, different produce mix, more olive oil instead of starches) cuts the number nearly in half. So “plant-based = high MNP” is not automatic; the specific mix matters a lot.

Things the model gets wrong or glosses over:

  • Uses Conte’s numbers as the produce baseline. Orhan’s 5-OoM-lower numbers would drop the vegetarian estimate to ~10⁴ particles/day. The truth is probably somewhere between, but the whole “which diet wins” ranking is hostage to this methodological choice.
  • Doesn’t model your kitchen. The paper separately notes plastic cutting boards release 14.5-71.9 × 10⁶ particles/year for PE boards, ~79 × 10⁶ for PP boards PubMed Central, a blender for 30 seconds releases 0.36-0.78 × 10⁹ MNP particles from its plastic container PubMed Central, and new plastic kettles can release up to 3.5 × 10⁷ microplastic particles per 1 dm³ of water during boiling PubMed Central. These can dominate any dietary pattern if present. Someone on a “Western” diet using a plastic kettle and plastic cutting board will beat a vegetarian using glass/wood/metal easily.
  • They explicitly dismiss inhalation as minor (~2.16 × 10³ particles/year per Domenech & Marcos) PubMed Central which contradicts some other estimates but lets them focus on food. If that dismissal is wrong, the whole relative ranking could shift.

Counter-intuitive finding also in that paper, worth flagging:

  • Mason et al. found water in glass bottles was less contaminated (204 MPs/L) than plastic bottles (1410 MPs/L), but Gambino et al. and Bavarian studies found glass bottles had MORE microplastics than PET bottles because of the painted metal caps and bottle-cleaning processes PubMed Central. Glass-not-automatically-clean is a real pattern — applies to your syringe-path reasoning too (the plastic Luer cap on your Bitomic is doing more work than you might assume).

Takeaway for your case:

You’re almost certainly in the high-MNP dietary category, but not because “vegetarian bad” — because produce is high-p/g and you eat a lot of it. Your kitchen setup (Chemex, presumably not plastic-kettle, presumably glass/metal/wood utensils) probably puts you below the 69M/day model estimate; but the Conte-vs-Orhan uncertainty is still the dominant knob, and no one has actually measured an individual’s oral MNP intake directly end-to-end. The whole analysis is an educated guess stack.

What this does mean: the “food reduction from GLP-1 saves MNPs” argument holds regardless of which methodology you trust, because it’s a within-person percentage reduction. If you were at 10⁷/day, you drop to 0.6×10⁷. If you were at 10⁹/day, you drop to 0.6×10⁹. The ratio to your injection load (bounded by glass-syringe physics, not dietary uncertainty) still flips the answer toward net-save.

#4

CAVEAT:

What this actually implies for the European vs US dietary question:

If the Cornell model is right that seafood drives ~70% of dietary MNP intake, and Mediterranean seafood is drawn from one of the most contaminated basins on Earth, then coastal Italy/Spain/Greece/France/Turkey populations should be high for dietary MNPs, not low. Not Indonesia-level (where seafood consumption per capita is much larger), but substantially above the US 2.4 g/month figure for anyone eating regular coastal Mediterranean seafood.

This also means the Duda & Petka finding — that the “Mediterranean diet” pattern has lower modeled MNP intake than lacto-ovo-vegetarian — is probably underestimating the real intake for actual Mediterranean residents, because the paper uses generic food MNP concentrations rather than location-specific ones. A Spaniard eating Catalonian anchovies is getting hammered in a way the Duda model doesn’t capture.

Additional thing I should flag that I’ve been ignoring: coastal atmospheric MNPs. The Mediterranean’s semi-enclosed basin, dense coastline population, and wind patterns mean sea-spray aerosols carry MNPs inland Frontiers. So it’s not just dietary — anyone living within tens of km of a contaminated coast is inhaling marine-origin MNPs in addition to indoor-source ones. The Cornell inhalation numbers (which are based on indoor air pollution models) probably underestimate coastal Mediterranean exposure for the same reason.

#5

Probably yes, on raw particle count. Vegetarians and vegans who eat a lot of fruit, vegetables, legumes, grains, nuts, and seeds probably do ingest more MNP particles than lower-volume omnivores, because the calculation is brutally simple: grams of food × particles per gram. Humanity has invented a contaminant where salad can lose on particle count. Impressive little civilization.

The strongest direct support is a 2025 dietary-pattern review that compared European-style diets and estimated the lacto-ovo-vegetarian diet at ~69.1 million MNP particles/day, versus about 36.4 million/day for a Western diet and 37.5 million/day for a Mediterranean diet. The authors attributed the vegetarian result mainly to the high share of fruit, vegetables, legumes, and nuts. (MDPI)

A separate 2025 comparative analysis of 193 food-MP papers also concluded that although seafood gets disproportionate attention, fruit/vegetables and grains can yield the highest estimated daily intake, with vegetables, grains, and meat all important sources. That review also found a ridiculous intake range, from near-zero to 3.8 × 10⁸ particles/day, because measurement methods are still a procedural clown car. (ScienceDirect)

The quick model

If a vegetarian eats 500 g/day more plant food than an omnivore:

Particle estimate used Extra MNPs/day Extra MNPs/year
Low fruit/veg study, ~2.9 particles/g ~1,450/day ~0.53M/year
High small-particle produce study, 52,050 to 233,000 particles/g ~26M to 117M/day ~9.5B to 43B/year

That range is absurdly wide because different studies are measuring different size bands and using different detection methods. Oliveri Conti et al. reported 52,050 to 233,000 particles/g in fruit/vegetable samples for particles under 10 µm, with apples and carrots among the high items. (ScienceDirect) A 2023 Turkey study, looking at larger/visible particles in common fruit and vegetables, found only 2.9 ± 1.6 particles/g, and explicitly noted that the huge gap from the Italian study is largely because the Italian work captured much smaller particles. (MDPI)

So the answer depends on whether you count the small stuff. And for health, the small stuff is probably the more interesting stuff. Naturally, it is also the hardest to measure, because why would reality be cooperative.

But higher intake does not automatically mean higher systemic burden

Raw particle count is not the same as absorbed/body burden. EFSA’s older toxicokinetic position was that only particles below roughly 150 µm are likely to cross the gut epithelium, and absorption is expected to be limited. (EFSA Journal) The FDA also emphasizes that there are still no standardized, validated methods for detecting and quantifying MNPs in foods, especially nanoplastics, and that current evidence does not yet establish that detected food levels pose a demonstrated human-health risk. (U.S. Food and Drug Administration)

There is also a particle-count vs mass split. A 2026 Barcelona biomonitoring study found MNPs in 52% of stool and urine samples and estimated food exposure far above beverage exposure, but in mass terms animal products were the main contributors in that small cohort. It also found short-term diet seemed to reflect exposure better than long-term dietary labels. (ScienceDirect)

So:

Particle count: vegetarians likely higher, especially high-produce/high-grain/high-legume vegetarians.
Mass of plastic: not necessarily; animal products, processed foods, and packaging can dominate.
Absorbed/systemic burden: unknown, but small particles in plant foods make this nontrivial.
Health tradeoff: not a reason to stop eating plants, because replacing vegetables with ultra-processed low-volume trash to dodge MNPs would be a masterpiece of human overcorrection.

This is basically the correction in your pasted context too: once produce MNP counts are taken seriously, a high-volume plant-heavy diet can dominate the MNP calculation.

#6

ok what geographic sourcing works? E says “montana bison”

11:08 AM

Claude responded: Montana bison has real directional merit but the typical “elite performance” framing overstates the magnitude.

Evaluated Montana bison claim’s merit against atmospheric contamination reality

Evaluated Montana bison claim’s merit against atmospheric contamination reality

Montana bison has real directional merit but the typical “elite performance” framing overstates the magnitude. Let me unpack what geographic sourcing actually does vs. doesn’t do for MNPs.

What geography actually buys you

The variables that matter, in rough order of importance:

  1. Inland vs. coastal. Sea-spray aerosols + seafood-sourced diet are probably the single biggest geographic swing. Montana is ~1500 km from the nearest ocean. This is real — inland atmospheric MNP deposition is ~10-50× lower than coastal.
  2. Population density. Tire wear, synthetic textile shedding, and urban runoff track population. Montana ranks 48th of 50 US states in density. Factor-of-5-10 reduction in airborne MNP vs. urban corridors is plausible.
  3. Downwind position. Montana is upwind of US agricultural plastic mulch zones (Midwest/California). Prevailing westerlies carry particles from Montana to the Midwest, not the reverse. This is a real but modest (~2-3×) factor.
  4. Native pasture vs. industrial ag. No plastic mulch, no plastic-coated fertilizer, no plastic silage wrap, no irrigation drip tape. Bison on native range avoid all of these; feedlot cattle don’t.
  5. Altitude. Higher elevation = less atmospheric MNP deposition. Montana ranches are typically 3,000-6,000 ft. Minor factor (~1.5-2×).

Multiplicatively, this could plausibly stack to 10-50× lower per-gram MNP content than e.g. Mediterranean anchovies or Iowa feedlot beef. That’s real, but it’s nowhere near “clean.” Everest snow has MNPs. Antarctic ice has MNPs. No food on Earth is meaningfully MNP-free. The best sourcing gets you maybe 1-2 orders of magnitude reduction, not elimination.

Where Montana bison specifically wins vs. where the claim is hype

Real wins:

  • Very low marine MNP contribution (the single biggest category in most intake models)
  • Minimal agricultural plastic contact during animal’s life
  • Ruminant: bioaccumulation from grass is lower than filter-feeder seafood concentration
  • Water source: mountain springs, low upstream contamination

Things that neutralize the win:

  • Processing still involves plastic (band saws, cutting boards, vacuum packaging). The Luo et al. cutting board data (100-300 MPs per mm per cut) applies at the butcher. Buying whole-animal cuts or on-ranch butchering closes this gap.
  • Atmospheric deposition still hits Montana — PFAS and MNPs have both been found in high-altitude snow globally
  • If the bison is shipped vacuum-packed across the country, the packaging MNPs probably exceed whatever was in the meat pre-packaging

The actually important sourcing hierarchy for MNPs (approximate, high confidence on direction, low confidence on magnitudes):

  1. Avoid seafood from contaminated basins (Mediterranean, SE Asia, NE Atlantic estuaries). This is the biggest single lever — 100-1000× differences exist in measured fish MNP content.
  2. Avoid filter feeders anywhere (mussels, oysters, clams concentrate MNPs by orders of magnitude).
  3. Avoid heavily packaged processed foods — processing/packaging often dominates source contamination.
  4. Sourcing geography for land animals (~5-50× effect).
  5. Sourcing geography for produce (~2-10× effect; atmospheric deposition is more uniform than marine).

For your actual diet (vegetarian)

The Montana-bison logic translates to:

  • Mountain West produce — Idaho, Montana, Colorado organic produce avoids Midwestern plastic-mulch agriculture and California agricultural plastic use. The effect is smaller than for meat (maybe 2-5×) because atmospheric deposition is the dominant input for plants, not contaminated feed.
  • High-altitude tree nuts — California almonds grow in heavily plastic-mulched orchards in a major ag corridor. Walnuts from smaller Pacific Northwest operations, pecans from Mountain/South regions are probably lower, but I don’t have direct measurements.
  • Coffee: the dirtier variable in your diet. Tropical agriculture (Ethiopia, Colombia, Vietnam, Brazil) has heavy plastic use, and coffee beans travel through many processing and packaging stages before your Chemex. Switching to a specific-farm / whole-bean / minimal-packaging source (glass or paper, not foil-lined plastic) probably matters more than anything else on your produce side. Light-roast traceable beans from a small Mountain-West roaster in paper packaging is the Chemex-equivalent of Montana bison.
  • Olive oil — dark-glass-bottled, single-origin (Andalusia, California mountains, Australia) vs. plastic-bottled blended Italian.

What I’d push back on in the “elite performance” framing

The biohacker version of this argument usually packages real MNP-reduction benefits with claims about heavy metal content, pesticide load, omega-6 ratios, etc. — many of which have weaker evidence. The MNP-sourcing logic is defensible. The rest is variable. Don’t assume that because “Montana bison is clean” on one axis it’s correspondingly clean on others.

My actual confidence here: directional claims about inland > coastal, native pasture > industrial ag, low-density > high-density are well-supported (maybe ~0.7-0.85 confidence). The specific magnitudes I’ve quoted (factor-of-X) are soft — they’re reasoned extrapolations from scattered studies, not direct measurements comparing Montana bison to Mediterranean tuna head-to-head. I don’t think anyone has done that study.

You said: "Idaho, Montana, Colorado organic produce avoids Midwestern plastic-mulch agriculture and California agricultural plastic use.

“Idaho, Montana, Colorado organic produce avoids Midwestern plastic-mulch agriculture and California agricultural plastic use.” are you sure? eastern WA uses a lot of plastic-mulch - I FOUND OUT ABOUT THIS FROM AAAS2025 meeting, and eastern WA is similar to idaho/montana

11:11 AM

Claude responded: You’re right, I was oversimplifying.

Acknowledging user’s correction about Eastern Washington plastic mulch

Acknowledging user’s correction about Eastern Washington plastic mulch

You’re right, I was oversimplifying. Let me actually check.

Acknowledged error, recalibrated geographic assumptions toward crop-type specificity

Acknowledged error, recalibrated geographic assumptions toward crop-type specificity

You’re right. I grabbed another clean regional story that doesn’t hold up. Let me fix it.

Eastern WA does use plastic mulch extensively. The 2022 Li/Ding/Flury study on 32-year plastic mulch accumulation had co-authors at Washington State University (Pullman and Puyallup) — Flury’s lab specifically works on plastic mulch degradation in PNW agricultural systems PubMed. Ghimire et al. tested biodegradable mulch films in Washington State over 4 years — recovery rate was only 71% after 2 years and 35% after 4, with biodegradable plastics likely taking more than 4 years to reach 90% degradation under WA field conditions SpringerOpen. The 2025 Frontiers review on PNW plasticulture states explicitly: “In regions like the Pacific Northwest (PNW), with robust agricultural and aquaculture sectors, plastics from films, mulches, cages, and ropes are significant sources of MPs” Frontiers.

The Columbia Basin in eastern WA is actually a worse case than I implied, because:

  • Semi-arid irrigated ag uses more plastic mulch, not less — water retention is the main driver
  • Eastern WA specialty crops (potatoes, onions, apples, cherries, wine grapes) are plastic-heavy: mulch, drip tape, row covers, hail nets, orchard weed mats
  • Greenhouse-based cultivation, vegetable crops, orchards, and vineyards are significant contributors to increased soil microplastic contamination MDPI
  • Eastern Idaho (Magic Valley/Snake River Plain) and southern Idaho match the same pattern

So the actual pattern isn’t geographic, it’s crop-type.

High-plastic-mulch crops (avoid or check sourcing carefully):

  • Strawberries (globally dominant use of plastic mulch)
  • Tomatoes, peppers, melons, squash
  • Onions, potatoes (plastic mulch common; drip tape everywhere)
  • Anything greenhouse or high-tunnel grown
  • Orchard and vineyard crops with weed mats or ground cover fabric

Low-plastic-mulch crops:

  • Grains (wheat, barley, rye, oats) — almost never mulched
  • Dry legumes (lentils, dry beans, chickpeas) — rarely mulched
  • Tree crops without weed mats (wild-harvested, old-growth orchards, some organic operations)
  • Forage-based meat (Montana bison works for this reason specifically, not because Montana is clean — because bison eat grass, and grass doesn’t get plastic-mulched)

The Montana bison heuristic works for the meat category because it maps onto “the animal ate grass, not plastic-mulched corn/soy feed.” It doesn’t generalize to produce for the reason you’re pointing at — produce-growing regions, wherever they are, tend toward plastic mulch whenever irrigation and high-value crops meet.

Better heuristics for your (vegetarian) diet:

  • Grain-based staples > specialty vegetables for base calories. Wheat, oats, barley, rye, rice grown outside intensive plastic-mulch zones (and rinsed).
  • Dry legumes > anything mulched. US-grown lentils (Palouse/Montana), dry beans (various), chickpeas.
  • Tree nuts: source matters. California almond orchards use a lot of plastic (weed mats, row covers, irrigation); Mediterranean/Middle Eastern almonds often less; wild-harvested or small-farm pecans/walnuts from Mountain West or South are likely lower.
  • Produce: prioritize crop-type over geography. Crops that aren’t typically plastic-mulched (leafy greens from small-scale farms without weed mats, apples from older orchards without ground cover, root vegetables grown in bare-soil systems).
  • Avoid biosolid-fertilized land entirely if possible. In Europe, biosolid-treated soils had MNP concentrations significantly higher than untreated soils; the US regulates biosolids under the Clean Water Act but unclassified pollutants still get applied through regulatory gaps Frontiers. Hard to track from the consumer side unless a farm specifically advertises no-biosolid practice.
  • Coffee: single-estate, shade-grown, minimal processing, paper-not-foil packaging. Ethiopia heirloom or Central American shade-grown avoids the industrial plasticulture coffee operations more than origin-by-country does.

Meta-lesson for this whole thread: I keep reaching for tidy heuristics (seafood dominates, vegetarians are high, Mediterranean is clean, Mountain West is clean) and each time the underlying reality is more crop-specific, farm-specific, and polymer-specific than the heuristic allows. The real answer to “what sources clean” is almost always “check the specific production practice” rather than any geographic or categorical shortcut. Geographic sourcing mostly works as a proxy for production-practice differences that correlate with region — when the proxy breaks (eastern WA is arid + high-value = plastic mulch, same as California), the heuristic fails.

You said: "Dry legumes (lentils, dry beans, chickpeas) — rarely mulched

"Dry legumes (lentils, dry beans, chickpeas) — rarely mulched

but DO LEGUMES have lower MNP loads? the mediterranean study you mentioned above says… otherwise? where does eden foods source its legumes?

11:13 AM

Claude responded: Good catch — I was reasoning from “less plastic mulch upstream” to “lower MNP load in the food” without checking whether that’s actually the measurable pattern.

Good catch — I was reasoning from “less plastic mulch upstream” to “lower MNP load in the food” without checking whether that’s actually the measurable pattern. Let me separate what I know from what I was assuming, then look up Eden.

The legume question

What I was implying: less plastic mulch → less MNP uptake → lower MNP in final food.

What the data actually says: the causal chain has several loose joints. Legumes specifically — I don’t have direct p/g measurements in hand. The Duda & Petka review groups “fruit, vegetables, legumes, and nuts” together as contributing to the vegetarian pattern’s high total, which suggests legumes aren’t trivially low, but they didn’t break out per-category numbers. So my confidence here was thin and I shouldn’t have phrased it as settled.

Reasons legumes might have lower MNP loads than produce:

  • Seeds, not root vegetables or leaves (different uptake pathway)
  • Hard seed coat, removed before consumption in many cases
  • Dry, not water-rich (different contamination mechanics)
  • Often grown in rainfed systems without plastic mulch

Reasons legumes might not be lower:

  • Biosolid fertilization is common on US pulse crops (Palouse region uses sewage sludge)
  • Atmospheric deposition doesn’t care about crop type
  • Processing + packaging: canned beans pick up MNPs from can liners (BPA-replacement coatings are often polymer); dried beans in plastic bags pick up shedding
  • Long soaking times in tap water (which has MNPs)
  • Cooking in water that may leach from plastic-lined equipment

So the direction “legumes < produce” is plausible but unverified by direct measurement that I’ve seen. I’d put it at maybe 0.5-0.6 confidence rather than the implied near-certainty I wrote with.

Let me check Eden specifically.

Synthesized Eden’s sourcing practices and weighed dry versus canned legume contamination risks

Synthesized Eden’s sourcing practices and weighed dry versus canned legume contamination risks

Honestly, on legumes having lower MNP than produce — I overstated. I don’t have direct p/g measurements for dry beans. The Duda & Petka model grouped legumes with produce as contributing to the high vegetarian total, which means they’re not assumed-low in that model either. The theoretical reasons they might be lower (seed not leaf/root, hard coat, dry not water-rich, often rainfed without mulch) are plausible but unverified by direct study I’ve seen. Call it 0.5-0.6 confidence that legumes < produce on a p/g basis, not the near-certainty I wrote with.

Residual contamination pathways that hit legumes regardless of growing practice:

  • Atmospheric deposition (applies uniformly)
  • Irrigation water where used
  • Polymer-coated slow-release fertilizers (where used — less so for nitrogen-fixers)
  • Biosolid fertilization (prohibited under USDA organic, allowed otherwise)
  • Processing water (tap water has MNPs)
  • Packaging: big variable. Can liners, plastic bags, bulk bin plastic.

Eden specifically

Per their own site:

  • Most EDEN beans are grown in the Midwest near their Clinton, Michigan headquarters and cannery. Garbanzos and lentils come from more arid regions: California, Arizona, Colorado, or North Dakota Eden Foods
  • All canned and dried beans from US organic family farms; custom cans have BPA, BPS, and phthalate-free linings Eden Foods
  • Beans are washed then soaked overnight in stainless steel soaking tanks Eden Foods
  • Dry beans come in 1 lb recycled/recyclable paperboard boxes, packed on equipment that handles wheat and soy Eden Foods
  • Organic certification (no biosolids allowed)

The good for MNP:

  • USDA organic → no biosolid application on farmland (significant)
  • Midwest bean belt → low plastic mulch use on commodity beans (beans are rarely mulched)
  • Stainless steel soaking, not plastic vats
  • Dry beans in paperboard → zero plastic packaging contact
  • Eden changed the entire US food-can industry on BPA in the 1990s, so they’ve been unusually thoughtful on food-contact materials longer than anyone else

The still-there for MNP:

  • “BPA/BPS/phthalate-free can linings” are still polymer linings — typically polyester or acrylic-type, and they still shed. “BPA-free” addresses endocrine disruption, not MNP shedding. The switch didn’t eliminate plastic contact with the food, it changed which plastic.
  • Garbanzos/lentils from AZ/CA → arid irrigated ag, which per your Eastern WA point does use more plastic drip tape and sometimes mulch for some crops, though chickpeas and lentils specifically are usually rainfed dryland crops. North Dakota lentils are almost certainly dryland — this is the Palouse-style cropping system.
  • Canning water is municipal water, which has MNPs at whatever level that municipality has.

Ranking for your use case, best to worst on MNP axis specifically:

  1. Dry Eden beans in paperboard — probably the cleanest reasonably available option. No can liner, no plastic packaging, organic, US-sourced, nitrogen-fixer so minimal CRF exposure. The only MNPs are from atmospheric deposition, irrigation/rainwater, and whatever comes from your own soaking/cooking water.
  2. Jovial or other glass-jarred beans — the jar is true zero-polymer contact for the beans, probably marginally better than Eden canned on that axis, but more expensive and fewer varieties. Worth noting as the actual cleanest option if money isn’t the constraint.
  3. Eden canned — BPA/BPS/phthalate-free polymer liner, so better than conventional cans, but not free of polymer contact.
  4. Conventional canned beans — old BPA-lined cans still exist in some markets; BPA was the worst but the replacements still shed polymer particles. Also typically non-organic, so biosolid-risk.
  5. Bulk bin dry beans in plastic scoop/bag — dry is good, but the plastic bag + bin shedding puts them below paperboard-packed.

For lentils specifically, Timeless Natural Food (Montana, dryland-farmed in paper bags) and Bluebird Grain Farms (Methow Valley, eastern WA — and now we’re back to your point about eastern WA; their lentils are dryland-farmed though, not irrigated, so the plastic mulch concern doesn’t apply to them specifically even if it does to the region’s potato/apple/onion operations).

What I can’t confidently tell you: whether switching from Eden dry to Jovial glass-jarred actually produces a measurable MNP reduction in your body. The theoretical gap is real but probably smaller than the shot-to-shot variability in measurement methods, and it’s certainly smaller than the Conte-vs-Orhan uncertainty that dominates the whole produce side. It’s a real improvement on the margin, not a life-changing one.

https://claude.ai/share/448ae5ea-41d1-478b-b874-51c9fc2a2227