Choose your natural plant poison: lectin, tannin, cyanide or aflatoxin.
Plants are not just food for animals.... The world is not green. It is colored lectin, tannin, cyanide, caffeine, aflatoxin, and canavanine [Janzen (16)].
From
Dietary Pesticides (99.99% All Natural)
BN Ames, M Profet and LS Gold
The toxicological significance of exposures to synthetic chemicals is examined in the context of exposures to naturally occurring chemicals. We calculate that 99.99% (by weight) of the pesticides in the American diet are chemicals that plants produce to defend themselves. Only 52 natural pesticides have been tested in high-dose animal cancer tests, and about half (27) are rodent carcinogens; these 27 are shown to be present in many common foods. We conclude that natural and synthetic chemicals are equally likely to be positive in animal cancer tests. We also conclude that at the low doses of most human exposures the comparative hazards of synthetic pesticide residues are insignificant.
Ames, B.N., Profet, M., and Gold, L.S. (1990b) Dietary pesticides (99.99% all natural). Proc. Natl. Acad. Sci. USA, 87, 7777-7781.
Toxicological examination of synthetic chemicals such as pesticides and industrial pollutants, without similar examination of the chemicals in the natural world to use for comparison, has generated an imbalance in both data and perception about potential hazards to humans (1-6). In this and two accompanying papers (7, 8), we try to redress this imbalance and discuss in detail one major group of natural chemicals in our diet-nature's pesticides.
About half of all chemicals (whether natural or synthetic) tested chronically in animal cancer tests at the maximum tolerated dose (MTD) are carcinogens (7, 9-14).¶ The MTD of the test chemical is a near-toxic dose that can cause chronic mitogenesis, often as a result of cell killing (7). We have argued that mitogenesis increases mutagenesis, and therefore that a high percentage of all chemicals might be expected to be carcinogenic when tested chronically at the MTD (7). A high proportion of both natural and synthetic test chemicals are positive for carcinogenicity. Natural chemicals constitute the vast bulk of chemicals in the human diet and therefore should be used as a reference for evaluating possible carcinogenic hazards from synthetic chemicals. In recent years, we have compared the possible hazards of various
rodent carcinogens, using the human exposure/rodent potency (HERP) ratio (1, 6). It should be emphasized that as the understanding of carcinogenesis mechanisms improves, these comparisons can be refined but they cannot provide a direct estimate of human hazard. This paper does not extend the HERP comparisons (1) because our purpose is different and space does not allow a proper analysis.
Nature's Pesticides: Mutagenicity and Carcinogenicity
Plants are not just food for animals.... The world is not green. It is colored lectin, tannin, cyanide, caffeine, aflatoxin, and canavanine [Janzen (16)].
Dietary Pesticides Are 99.99% All Natural.
Nature's pesticides are one important subset of natural chemicals. Plants produce toxins to protect themselves against fungi, insects, and animal predators (5, 16-23). Tens of thousands of these natural pesticides have been discovered, and every species of plant analyzed contains its own set of perhaps a few dozen toxins. When plants are stressed or damaged, such as during a pest attack, they may greatly increase their natural pesticide levels, occasionally to levels that can be acutely toxic to humans. We estimate that Americans eat about 1.5 g of natural pesticides per person per day, which is about 10,000 times more than they eat of synthetic pesticide residues (see below). As referenced in this paper (see refs. 16-21 and legends to Tables 1 and 2), there is a very large literature on natural toxins in plants and their role in plant defenses. The human intake of these toxins varies markedly with diet and would be higher in vegetarians. Our estimate of 1.5 g of natural pesticides per person per day is based on the content of toxins in the major plant foods (e.g., 13 g of roasted coffee per person per day contains about 765 mg of chlorogenic acid, neochlorogenic acid, caffeic acid, and caffeine; see refs. 22 and 23 and Table 2). Phenolics from other plants are estimated to contribute another several hundred milligrams of toxins. Flavonoids and glucosinolates account for several hundred milligrams; potato and tomato toxins may contribute another hundred, and saponins from legumes another hundred.
Grains such as white flour and white rice contribute very little, but whole wheat, brown rice, and corn (maize) may contribute several hundred milligrams more. The percentage of a plant's weight that is toxin varies, but a few percent of dry weight is a reasonable estimate: e.g., 1.5% of alfalfa sprouts is canavanine and 4% of coffee beans is phenolics. However, the percentage in some plant cultivars is lower (e.g., potatoes and tomatoes).
......continues at original.
see also
http://www.fortfreedom.org/n16.htm
http://reason.com/amesint.shtml
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11843442&dopt=Abstract
http://www.nasonline.org/site/PageServer?pagename=INTERVIEWS_Bruce_Ames
http://potency.berkeley.edu/text/pesticide.html
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