onacruse
I was especially thinking of Seventh-Day Adventism as the most successful heir of the Millerite movement: very early their doctrine combines a belief in the "last days" with dietary counsel and interest in health, health reform or alternative medicine. This was true of the early Watchtower days, too (cf. the many "health" articles in The Golden Age, which addressed a similar audience). Gradually the health aspect was toned down (although the blood prohibition might indeed be construed as one unconscious resurgence or perversion of it).
I said paradoxical because there is an apparent contradiction between the belief that the end is near and the concern about present health improvement. But you can also see it as a compensation... Adventism (including the WT) owes as much to disappointment about short-term eschatology as to short-term eschatology itself.