In fact, many phytochemicals are poisonous to humans since they are the plants defence systems.
"Poisonous" and "Toxic" are very inflammatory (pun-intended) words. But the dose makes the poison. A glass of water is refreshing and healthy. But 6 litres, consumed within an hour will kill us. Also, the idea that what doesn't kill us, makes us stronger, is not just a platitude. Within the context of our biology, it's the very things that challenge our systems that, via hormesis, make us stronger and better able to survive. This is why certain amounts of hermetic stress, be it through cold exposure, fasting, dealing with germs and bacteria - even the process of destroying muscle tissue, in order to build newer and stronger tissue - All of this, if we can overcome the discomfort, will shore the body's systems against bigger toxic attacks.
Specific to the idea of plant-toxins on a plant-based diet, I know I'm not the only one who initially experienced discomfort, bloating and gas when hugely increasing my intake of the lovely lectins found in beans, legumes etc. But, again, I'm not the only one for whom perseverance has given me the power to eat bowls upon bowls of the stuff, with zero negative effects. My body prevailed, and I feel many time healthier for it.
By the way, the Low Carb Diet was introduced into medical practice in 1862, and has been in use as a treatment since. How many generations do you need? When was the vegan diet recognised? Nov 1944 I believe.
And were we playing dietary top-trumps, you'd have me on 'Date of introduction into medical practice'. But I'm really only interested in real-world results and getting to the truth. That's why I'm quite capable of seeing the benefits of a low-carb diet (one that even includes animal products), despite the fact that plant-based and vegan dogma would have me believe otherwise.
Further to that, perhaps you could scroll up a few posts to see that I'm very much distancing my discourse from veganism.
How many generations do you need?
Perhaps you are confusing what i mean by multiple generations. In the context of my earlier response, I'm making the point that just because we have evolutionary systems designed to keep us going without carbs, doesn't mean that any health benefits will be passed on to the children or grandchildren.