Fiber is not a nutrient; fiber is any part of a food which cannot be digested. It's no surprise that oranges have more pulp than orange juice. As for micronutr

Fiber is not a nutrient; fiber is any part of a food which cannot be digested. It's no surprise that oranges have more pulp than orange juice. As for micronutrients like vitamins, all of them can be destroyed by heat. All forms of cooking reduce the amount of vitamins in the food, and pasteurization is no exception. The trade-off is generally worth it, however, as it takes a fair amount of work to avoid enough foods that you end up with a deficiency, and the health benefits of killing the bacteria are so great. Also, fruit juice has a lot of sugar in it; you don't want it to be too large a part of your diet anyway.