The magazine's messages often centered on the pseudo-scientific doctrine of British Israelism, the belief that the early inhabitants of the British Isles, and hence their descendants, were actually descendants of the Ten Lost Tribes of Israel.

After Armstrong's death in 1986, new WCG leadership sought to change the core principles of WCG doctrine, quashed publication of Armstrong's writings, sold off most of the church's holdings, and began offering magazine subscriptions for sale.

WCG leadership eventually changed the name of the organization and embraced positions closer to those of mainstream Protestantism.

After Joseph W. Tkach took over, leading to a major doctrinal transformation of the Worldwide Church of God, the circulation of The Plain Truth, distributed free by subscription and via newsstand distribution around the globe, fell from a peak of 8 million to less than 100,000 before it switched to a paid subscription status.

With The Plain Truth being ceded to Plain Truth Ministries,[1] the traditional magazine has changed its format and replaced by two distinct publications: Plain Truth Ministries also publishes a monthly newsletter CWR/PTM Monthly Letter, a CWR Blog, a Daily Radio Show, a Weekly Audio Teaching Ministry.