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Dear Yahoo!:
Is it true that your body gets immune to your deodorant, and if so, does rotating deodorants really work?
Ryan
Columbus, Ohio
Dear Ryan:
As far as we could determine, the deodorant immunity theory is bunk. However, deodorants have varying ingredients, and people have varying chemistries, so it may make sense to mix things up if you've been told you emit unpleasant odors.

The scientists behind Secret spell it out plainly: "This is a popular myth with no basis. You cannot become immune to your deodorant or antiperspirant."

However, the message boards of Digs Magazine ("a home and living guide for the post-college, pre-parenthood, quasi-adult generation") mention deodorants can stop working on account of changes in body chemistry.

Miss Bliss ("beauty online from New York's hottest spa") notes that women who have recently had children often encounter deodorant meltdown. This definitely plays into the personal biochemistry theory. She also warns against excessive deodorant use.

For general body odor problems, Dr. Donnica at Yahoo! Health suggests avoiding fried or spicy foods, as well as caffeine and garlic. And as a very last resort, you can always Botox your pits. Isn't the human body great?

 
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