Research has shown that depressive symptoms and high anxiety levels are often linked to a deficiency in folic acid. While all B vitamins have an impact on mood and metabolism, folic acid is particularly important. Asparagus is one of the most concentrated forms of folic acid available in a normal diet, and is also widely available throughout the world. There are a number of other active ingredients in asparagus that help optimize digestion and even boost cognition, two more factors that can affect the symptoms of social anxiety disorder.