Mental stress increases the excretion and hence the need for many nutrients. Among the most important are magnesium and vitamin C, both of which are used by the body in larger quantities during periods of physical and mental stress. [24,25] Compared with our past as hunters and gatherers, today┬┤s stress is often of a more permanent nature. Instead of experiencing occasional situations where we had to fight or flee, many of us live with recurring stress day in and out.
For example, while increased consumption of fruits and vegetables are related to decreases in mortality, cardiovascular diseases and cancers, supplementation with key factors found in fruits and vegetable, like antioxidants, vitamins, or minerals, do not help and some have been found to be harmful in some cases.[86][87] In general as of 2016, robust clinical data is lacking, that shows that any kind of dietary supplementation does more good than harm for people who are healthy and eating a reasonable diet but there is clear data showing that dietary pattern and lifestyle choices are associated with health outcomes.[88][89] 
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