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Reducing protein intake could increase human longevity, researchers recently suggested. That's a bad idea, for several reasons, experts say.

“Regulatory flexibility can be exercised in rare disease without sacrificing rigor,” writes Mindy Leffler, whose son has Duchenne muscular dystrophy.

Immunologist Liz Marnik grew up in a household that rejected vaccines, and she herself went without any immunizations into adulthood. At age 23 she visited a travel clinic and received all standar…