IIUC the parent comment, here's some similar logic: (a) (some) right-handed people are on diets. (b) (some) right-handed people are gaining weight. (c) ergo,

IIUC the parent comment, here's some similar logic: (a) (some) right-handed people are on diets. (b) (some) right-handed people are gaining weight. (c) ergo, right-handed people suck at dieting.