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D You would be healthier if you ate as your ancestors did.At least that's the pledge of some enthusiasts such as the "cave- man"-characterized by avoiding processed food and grains and only eating things like meat,fish,and seeds.But a new study suggests the food some early humans in Norway ate may have not only been unhealthy,but poisonous. Pollutants have been entering our food chain for thousands of years.In 2015,for example,researchers reported that cod caught off the North American coast around 6,500 years ago by Stone Age hunter-gatherers contained high levels of mercury ()This metal occurs naturally in Earth's crust and is thought to have leaked into the oceans in greater concentrations after sea