On the other hand, says Dr. Duncan, the widespread adoption of translucent plastic containers almost certainly changed the flavor of milk for the worse. By now, she says, consumers mistakenly believe that this is how milk is supposed to taste.
In blind tastings, two panels of more than 150 volunteers each were given milk and asked to rate their experience of it using a nine-point scale (in which 1 means dislike extremely and 9 means like extremely). Milk that had been exposed to fluorescent light had far more ratings in the dislike region of four or lower. Volunteers described the fluorescent-exposed milk as tasting like cardboard or seeming stale or painty.
Changes occurred in milk that affected flavor and quality after as little as four hours of light exposure, which were noticeable to untrained consumer panelists, the scientists write.
Fluorescent lighting has been named as a culprit in milk degradation before. But Dr. Duncan says that her study is the first to use regular retail dairy coolers, thereby simulating real-world milk storage conditions, and that it bolsters the case for LEDs in milk-storage cases. (LED stands for light emitting diode. Bulbs made with this technology are rapidly gaining market share thanks to falling prices, long life, low energy consumption and the pleasing quality of their light.)
How does fluorescent lighting affect milk? Scientists say that its higher ultraviolet energy, among other characteristics, triggers a process of oxidation that damages essential nutrients, especially riboflavin, resulting in inferior flavor as well as a less healthful beverage. Over longer time periods, LEDs can degrade milk flavor as well, though not as much. Notably, neither kind of light makes milk go sour any sooner.
Dr. Duncan says that she is working with the dairy industry (which partly funds her work) to encourage costlier packaging that blocks light and to suggest that retailers switch away from fluorescent bulbs.
Meanwhile, you might want to buy milk in cardboard cartons. If you are buying by the gallon (which usually comes in plastic packaging), Dr. Duncan suggests looking for jugs stored on lower shelves or pushed way to the back, as far as possible from any fluorescent lighting source.
Potts, Hayley, Kemia Amin and Susan Duncan, Retail lighting
and packaging influence consumer acceptance of fluid milk,
Journal of Dairy Science, November 2016
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