Sunlight, which created more of a problem when milk was delivered on the doorstep, and fluorescent light can cause an undesirable change in the flavor of milk. Researchers have discovered that milk stored in uncolored plastic jugs may develop a flavor change and a loss of vitamin A and riboflavin in a short period of time. Lowfat milk seems to lose these vitamins faster because it allows more light to penetrate. Neither vitamin D nor calcium are affected by light exposure. The loss of nutrients depends upon the intensity of the light source, length of exposure, and the distance from the light.
Colored jugs preserve flavor and vitamin A and riboflavin levels for a longer period of time.
Paperboard cartons are practically opaque to light so the problem of the milk developing off-flavors is eliminated. Many consumers, however, prefer a plastic jug with a handle and resealable cap. The colored jug is the dairy's way of satisfying the consumer while preserving milk's flavor and nutrients. Dean Foods and the Environment Source Reduction Source reduction is the single most important factor to eliminate solid waste. All of our plants have an aggressive source reduction plan in place with our packaging suppliers.