There are advantages and disadvantages of eating fresh and dried goji berries. The drying process removes water from the fruit, resulting with physical and chemical changes: color, shape, flavor and nutritional value. The drying process concentrates nutrients and calories, so fresh goji instead dried is recommended if you want to lose weight. Dried fruit lasts longer than fresh, but the high temperature causes degradation to the vitamin C. So, fresh goji berries can be a significant source of vitamins C and E.