I went through a period like that once but it was with lemons. I was working out 2 - 3 hours a day back then so I thought it might be my body needed to acidity or maybe even the vitamin C. Neither explanation seemed to be the case in the long run.
I found this on the eHow web site:
Lemons and limes are the winners in the citrus acidity count. Vitamin C (ascorbic acid) can comprise up to 32 percent of the fruits' weight. Lemon juice contains 187 percent vitamin C. Citric acid makes up 5 percent to 6 percent of the fruits' content. Lemons contain approximately 3 percent pantothenic acid. Fresh lime juice contains 121 percent vitamin C and 1 percent pantothenic acid.
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