”Small amounts of methanol are present in normal, healthy human individuals. One study found a mean of 4.5 ppm in the exhaled breath of test subjects.[19] The mean endogenous methanol in humans of 0.45 g/d may be metabolized from pectin found in fruit; one kilogram of apple produces up to 1.4 g of pectin (0.6 g of methanol.)[20]”
”Ingestion of as little as 3.16 grams of methanol can cause irreversible optic nerve damage, and the oral LD50 for humans is estimated to be 56.2 grams.[66]”
It doesn't mean it's safe to risk adding to the burden. The danger is that low-grade non-acute toxicity over the natural level could still be harmful over time. All it could take is one mutation.
”Small amounts of methanol are present in normal, healthy human individuals. One study found a mean of 4.5 ppm in the exhaled breath of test subjects.[19] The mean endogenous methanol in humans of 0.45 g/d may be metabolized from pectin found in fruit; one kilogram of apple produces up to 1.4 g of pectin (0.6 g of methanol.)[20]”
”Ingestion of as little as 3.16 grams of methanol can cause irreversible optic nerve damage, and the oral LD50 for humans is estimated to be 56.2 grams.[66]”
19: https://iopscience.iop.org/article/10.1088/0967-3334/27/7/00...
20: https://onlinelibrary.wiley.com/doi/10.1111/j.1530-0277.1997...
66: https://aoemj.org/journal/view.php?doi=10.1186/s40557-017-01...