We have often seen and/or experienced annoying involuntary muscle twitches in the corners of the eyes, in calf muscles etc. But I have wondered about their causes.
WebMD states that
[e]yelid twitches may be aggravated by having dry eyes. They may also be worsened by stress, lack of sleep, caffeine, and harsh light conditions.
Apart from (excess?) caffeine, can a lack of (or excess of) certain nutrition (sugar for example) be a cause of muscle twitches?
Note: Leg jiggling (for want of a better term) which can occur with nervousness, sugar rush or extreme excitement is not what I'm talking about.