Today, I was surprised to find a number of sources stating that lemons, while acidic in nature, act as bases once in the body. Here is one such source. I'm unclear whether the claims are based on shoddy science, or if there is any truth to the matter. This person claims that it is due to Na+ and K+ ions in the lemon, which then form strong, fully dissociated bases that counteract the weak citric acid.
However, I'm always skeptical (and rightfully so, I think) of this type of seemingly 'alternative' claim, as they frequently aren't based on the reality of the situation. Can anyone clear up whether this is actually a valid claim?