Dating op curacao model updating
Not all PCDDs, PCDFs, and PCBs are considered dioxins.
Only 17 out of 210 PCDDs and PCDFs are considered dioxin-like, and only 11 out of 209 PCBs are considered dioxin-like.
Even by conservative estimates, no one in the US is currently consuming a level of dioxins that would be expected to exert physiological harm.
This argument focuses on a class of chemicals called dioxins, and suggests that in the modern world, overburdened by pollutants, these fat-soluble chemicals accumulate specifically in the fatty tissue of animal products, making a vegetarian–even vegan–diet a necessity for those living in the modern world.
However, since the WHO’s TDI is supposed to assume the greatest degree of sensitivity, in order to yield the safest and most conservative estimate, the harm done to male rats exposed during gestation is the primary basis for the TDI.
(A picogram is a trillionth of a gram or a billionth of a milligram.) This means that a human whose intake of dioxins meets the WHO’s TDI is consuming only one-tenth of the concentration required to yield, after a lifetime of exposure, body burdens with concentrations that were required to produce the minimum physiological effect not in the most sensitive adult or child rat, but in the most sensitive rat , the critical period where a developing organism would be much more sensitive than at any other time.
However, since natural sources of dioxins like volcanoes and, more significantly, forest fires, are now primary sources of dioxins, and since pre-modern populations would be expected to have additional exposure through the direct inhalation of fumes from the incineration of heating and cooking materials (living, for example, in thatched houses without chimneys, as Price described the primitive Gaelics), as well as the use of incinerated materials as soil fertilizer (such as slash-and-burn techniques or the use of smoke-impregnated thatch as a fertilizer, both described by Dr.
Price), it is not unreasonable to conclude that we are now approaching a level of dioxin exposure similar to that of pre-industrial populations.