Nutrition answer may lie in the soil

American says that biological agriculture (a combination of organic and conventional farming) is the way forward.

As a physician as well an agriculturist, he was prompted by concern for his patients' health to consider the role of soil in creating a situation where he says much of the food eaten today is "seriously nutrient- deficient".

Compared with food grown 40 to 50 years ago, modern fare contains up to 60 per cent fewer nutrients, Andersen says.