Some dried fruit is Sulfited. Is this safe? Or should I stay away from it? I know some sulfur is naturally occurring, like in asparagus, and we obviously just pass the sulfur, hence the sulfur smelling urine. Is sulfited kiwi ok?
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Sulfites used in dried fruit can cause some problems with some people. http://edis.ifas.ufl.edu/fy731 It's not metabolically useful in humans, but it's not problematic either. Inorganic sulfur isn't all that important from a human nutrition POV.
Asparagus does contain some sulfurous compounds, which when metabolized cause the smelly pee. Specifically asparagusic acid, being metabolized into a cocktail of thiols/sulfoxides/sulfones (organic sulfur containing molecules) including the particularly malodorous dimethylsulfide. Non-vitamin, non-amino acid sulfur ultimately is just broken down an removed from the body.
The urine smell you're referring to is actually from ammonia, which is a common byproduct of your metabolism, and not from sulfur. Sulfur is actually rather important in small quantities (which is the quantity we normally receive it via foods such as onions) and is not so casually thrown away by your body.
Sulfites are compounds containing the SO3(-2) polyatomic ion. These compounds are typically added as preservatives, but can also occur in food naturally. Bad reactions to sulfites have been known to occur, though they are apparently rare.