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I have to wonder how toxic the human body is. I have read that bioamplification of pesticides and heavy metals can be a problem for fish and birds. A quick google only shows me vague possibilities when reviewing humans. Is it worse for us because we're bigger and long lived, or does processed food avoid that sort of problem?

We're an apex predator, so should receive all the amplification effects seen travelling up a food chain. Course having accumulated toxins, it depends what you do with them afterwards. Natural decomposition tends to spread it back to the bacteria, fungi and small animals at the very base of the food chain again.

Burn the body in a gas furnace for a few hours and release loads of ugly things. Including all the artificial fibres, coffin glues and plastics, and any fillings, implants etc. Mercury amalgam fillings can get to surrounding animals, even into fish off the coast. From memory something like 20% of uk atmospheric dioxins are from cremation.

If burying, the formaldehyde and other embalming chemicals leech into the ground along with any accumulated toxins in the body, and can prevent proper decomposition for decades or more. Embalming that's completely unnecessary for the timescale of most burials. Mostly those chemicals are ugly, and little studied when put in the ground in scale. Yet are studied when added in small amounts as fire retardants or glues in furniture etc. Then you have the US using steel coffins in concrete lined graves!

It's quite the ugly rabbit hole once you descend and start looking into burial and cremation.

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