Vincent Dunst, manager of a Berkeley-area food cooperative, has added two minutes to his life by consuming organic peanut butter instead of major brands, health-food experts reported Monday. 'Store-bought brands like Jif and Skippy are loaded with artificial emulsifiers and preservatives. Some of them even contain brown dyes to make them look more 'peanut buttery,'' Dunst said. 'This all-natural Sunset Farms peanut butter contains absolutely nothing but fresh peanuts and a little bit of sea saltand, as an added bonus, the jar is glass instead of plastic.' Dunst has also added 22 seconds to his life by starting off each day with a frosty, fiber-rich 'Bulgur Smoothie.' 