Years ago, in the 1930s, a scientist and doctor by the name of Francis Pottenger initiated a series of now famous feeding experiments with cats that spanned more than ten years and several feline generations. His findings transformed many people's view of the role that diet plays in health and reproduction.
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...We are too many unhealthy generations of "Pottenger's cats" into the Industrial Revolution and the ravages of a deteriorating food supply, and we are too genetically compromised by all this to indulge in a dietary approach dictated merely by one's superficial tastes (e.g. comfort of junk food) or wishful ideals (e.g. vegetarianism and veganism. Many people no longer have the same resilience of even a generation ago.
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I personally submit that we are now living in a world and in a time where there is no longer any room for error with respect to what we must do to maintain our health and survival. Pottenger's work has shown us that progressive generations with poor dietary habits result in increasingly more vulnerable progeny and that each subsequent generation with unhealthy dietary habits results in impaired resistance to disease, increasingly poor health and vitality, impaired mental and cognitive health, and impaired capacity to reproduce. It is all part of what we are seeing in our epidemic levels of poor health and the overwhelming rates of autism, violence, attentional disorders, childhood (and adult) behavioral problems, mental illness, fertility issues, and birth defects.
We are a few generations of Pottenger's cats, as humans, past the dawn of the Industrial Revolution and the ever-tightening tendrils of the unscrupulous, greed-driven food industry it spawned. We, as a species, have never been more vulnerable. Today, the effects of the increasingly widespread consumption of processed and fast foods are glaringly, if not disturbingly, clear. Add this to an increasingly contaminated environment, nightmarishly dangerous and spreading GMOs, a proft-based (rather than results based) and broken health care system, and a broken economy on a global scale, along with progressively inferior and deteriorating food and water supplies, and the implications are virtually, if not wholly, cataclysmic.
The odds are clearly stacked against us.