Using the toxicologists' maxim ""All things are poison and nothing is without poison; only the dose makes a thing not a poison." (normally "The dose makes the poison"), is there any food that does not/can not cause disease?
Which is very different from e.g. pointing out that while strychnine has an human LD50 of 1-2 mg/kg, "In low dosages, strychnine can act as a stimulant and has been used by athletes to enhance their performance." followed by a couple of Olympic examples in 1904 and 1992 (https://en.wikipedia.org/wiki/Strychnine).