[14] Science writer Martin Gardner noted that the photograph "shows what is obviously a common type of rock concretion" and geologists do not take McCann's claim seriously.

Creationist Arthur Isaac Brown supported the book, stating it offered "the most scathing and unanswerable indictment ever published against this untenable hypothesis.

[17] Hay Watson Smith a Presbyterian minister and theistic evolutionist commented that McCann and other creationists have "no standing whatever as scientists.

[2][20][21] He urged people to lower their consumption of meat and avoid white flour and refined sugar which he linked to cancer and heart attacks.

[21] McCann argued that white flour "was the product of greedy industrialists and violated "the provisions of the Creator".

[19] Historian Aaron Bobrow-Strain has noted that McCann espoused a combination of "Christian fundamentalist, white supremacy, and populist trust-busting".

[2] He wrote for the Globe for the next ten years making "frightening libels and wild statements" about food.

The Globe gave McCann a laboratory to perform food tests and hired a team of lawyers to defend him from defamation suits.

[2] He claimed that Americans were suffering from an alleged acid overdose from improperly combined carbohydrates, proteins and processed foods.

"[9] Historian of medicine James C. Whorton has described McCann as "America's most vociferous antagonist of processed foods.