He's a charismatic chemist. Everything we eat is contaminated with other stuff. Lots of conflicting dietary advice out there, changing all the time.
Numbers matter. "There are no safe substances, only safe ways to use substances." "Only the dose makes the poison."
Consumer's Guide to Food Additives, by Ruth Winter: full of major errors and misinformation. Web site of Joseph Mercola: full of major errors and misinformation. Seductive arguments, simplistic solutions to inaginary problems.
His web sites: www.oss.mcgill.ca, www.chemicallyspeaking.com.
Subrahmanyan Chandrasekhar: A study in fortitude and rigor
2 days ago in The Curious Wavefunction