Christian Bale Human Yo-Yo's Super Slim Again

Christian Bale's ditched any vestige of Dick Cheney from his life, and by that we mean roughly 100 lbs ... in just a matter of months.

CB and his fam -- like most of the world, it seems -- are on vacay in Italy and, during a Friday morning stroll, he looked incredibly thin. Incredible because 7 months ago he was way more bulked up for his role as the ex-veep.

This is kinda his thing -- Christian typically yo-yos like nobody's business for his roles. He got up to about 228 pounds for "American Hustle" ... and everyone remembers how scarily thin he was for "The Machinist." He shed almost 70 lbs for that one!

Looks like he's back to fighting weight now and, just as importantly, all his hair's back!

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