imitha isebenzisa indlela yokuhlonza nge--electrochemical. njengesampula, kusetshenziswa igazi le--capillary. isikrini esibanzi esinezinhlamvu ezicacile ngaphezu kwalokho sinokukhanya emuva okulula. a 2012 study by popkin et al shows that our diets have changed significantly over the past few decades. with modern diets too often dominated by processed foods, unhealthy fats and sugar, we’ve seen sharp global spikes in statistics relating to lifestyle illnesses like obesity, diabetes, and heart disease. terrifyingly, even if your diet does contain fresh vegetables, they’re probably not providing the same nutritional clout as they did 50 years ago. according to scheer and moss (2018) of scientific american, the soil depletion that is caused by intensive agricultural methods means that the nutritional value of our fresh fruits and vegetables is decreasing. ray (2015), of the new york times’ science q&a column, says that this nutritional decline is caused by more than just soil depletion. it can also be attributed to changes in farming methods, processing, preparation, pesticides, chemical fertilisers and the preference for high--yielding crops, which is associated with lower nutritional density. • the role of supplements how can we get enough nutrients to keep us healthy? ray (2015) says that the best approach is to eat “more vegetables, fruits, whole grains, nuts and beans, and less refined sugars, separated fats and oils and white flour and rice, which … have all suffered losses much greater than the potential losses for garden crops.” additionally, you can take nutritional supplements like vitamins and minerals. while they’ll not replace a healthy diet, many experts believe that supplements can help to bridge the gap between the nutrients you get from your food and what your body needs. some of the common supplements. • multivitamins according to medilineplus (2018), there are 13 essential vitamins that we need for healthy cell function and devel--