Heavy metals can be toxic to Candida just like its toxic to our cells. Toxic heavy metals will not feed Candida because Candida has no use for it(non-utlizing Metals). The biggest problem with heavy metals is its ability to impair our immune system and cause cell dysfunction.
Why would any type of living cell want to feed on something that’s toxic? If anything its going to try to pump it out of its cell/or try to develop resistance.
Mercury is toxic to candida..good post on the subject: