Ubiquitous access to food that causes disease does not make 'The poor of today better of than the middle class of the past'.
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).