A colleague informed him
of a startling trend: liver cancer was plaguing affluent Filipinos at a much higher rate than their less - wealthy counterparts — a phenomenon that, despite a
slew of other lifestyle differences, Campbell believed was linked to their higher intake
of animal protein.1 Bolstering his suspicions, Campbell also learned
of a recent study from India showing that a high protein intake spurred liver cancer in rats, while a low protein intake seemed to prevent it.2 Intrigued by this gem
of little - known research, Campbell decided to investigate the role
of nutrition in cancer growth himself — an endeavor that ended up lasting several decades and producing over one hundred publications (none
of which pertained to Fight Club).3