Because the plastic is minutely soluble in the acidic soultion. The Feds have examined it and say its not a health risk. Bottlers actually dislike plastic, but it became so popular they had no choice. The plastic is much more permeable than glass so carbonated beverages go flat quicker and juices go bad sooner.
Glass is also best for the environment. The thing I wonder about is why Michigan has bottle returns and the environmentalists in CA don't or why its just not a Federal law. I always feel so wasteful and uncomfortable when throwing away containers in other states.
http://www.webmd.com/parenting/baby/baby-bottles
http://www.canadianliving.com/blogs/...astic-bottles/
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