So all food is equivalent! Following your maxim, we can replace food stamps with an unlimited supply of strychnine and just let people choose a healthy dose for themselves.
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).