A walnut-enriched diet will cut cholesterol by an average of 0.3 points, according to a review of 13 studies involving 365 people. You need 30g a day to see the results in just one month.
Cashews have twice the iron concentration of minced beef.
Iron helps carry oxygen round the body. The lack of this nutrient can lead to extreme tiredness and poor concentration.
Just five pecans contain around a sixth of the recommended daily allowance for zinc, which is vital for the functioning of white blood cells that fight bacteria and viruses, including cold and flu.
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