Had (still have, fortunately) a mate who lost his flying licence at 50 after a grand mal attack whilst airborne. It may have been a coincidence, but he drank a lot of diet coke.
Can't stand the taste of diet drinks myself - it tastes as if the aluminium from the can has leached into the drink. (So on occasion, I drink 'normal' soft drink and take into my body the equivalent of six heaped spoons of sugar instead, which is probably equally as bad for me if in a different way!!!!)