Specifically, supermarket vs homegrown. It seems that over the past 80 years supermarket food has been losing nutrients and minerals at a rather hefty rate. Yellow courgette / yellow zucchini grown in a veggie garden kit The greatest reduction is in vital minerals such as sodium (-52%), iron (-50%), copper (-49%) and magnesium (-10%). ‘Records from the British Medical Research Council from 1940 to 1991 reveal that during this period carrots lost 75% of their copper and magne
