1. From the Department of Nutrition (K.B., M.C., J.D.F., A.A.), and Department of Epidemiology (K.B., A.A.), Harvard T.H. Chan School of Public Health, Boston; Epidemiology (J.D.F.), Biogen, Cambridge; Department of Physical Medicine and Rehabilitation (S.P.), Spaulding Rehabilitation Hospital and Healey Center for ALS, Massachusetts General Hospital; Harvard Medical School (S.P., M.A.S.); Department of Neurology (M.A.S.), Massachusetts General Hospital; Sean M Healey & AMG Center for ALS (M.E.C.),...