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By Dr Ross Walker I was recently sent the below question from a man in Western Australia: “Can you provide some information on human mineral requirements (both major and trace) as affected by age, gender and physical activities? By world standards Australian soils are generally regarded as relatively poor (proportion of clay, loam and sand) also affected by rainfall and potential for leaching. There is also an interaction with plant and animal uptake and storage.” Typically, when most people talk of nutrition, the focus is on macronutrients: fat, carbohydrates and protein. The fat and carbohydrates are our major energy sources,...

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