The sour taste has its foundations 
in the elements of earth and fire. 
It stimulates appetite and digestion and facilitates elimination of wastes from the body. In small or moderate amounts, sour is beneficial to Pitta and Kapha types, but this taste is especially helpful to Vatas, whose appetites are often irregular and for whom constipation is frequently a problem.

Elements: Earth, Fire

Effect on Dosha:
• Decreases Vata
• Increases Pitta, Kapha

Benefits:
• Increases appetite
• Promotes digestion
• Facilitates passing of gas
• Adds zest and flavor to other
  foods

Common Examples:
• Citrus fruits, grapes, plums, and 
  other sour fruits, yogurt, cheese, 
  tomatoes, salad dressings, 
  pickles, vinegar 

If taken in balanced amounts:
• Stimulates feelings of 
  exhilaration and a desire for 
  adventure

If taken in excess:
• May promote feelings of envy 
  or resentment