Many nutrients have been shown to be helpful during times of anxiety, both to help you cope with anxiety and also to offset the increased nutritional demands on your body due to stress. The first place to begin is to make sure your diet has plenty of vegetables and fruit, preferably fresh. (These provide high nutritional value with low calories.) Beyond that, herbs such as St. John's Wort have been shown in scientific research to be helpful, but before you take any herbs or vitamins for anxiety, be sure and discuss them with your healthcare provider.