I suggest you think first from principles and persuade everyone else to do so too. In this way we are trying to practice some ideals of the enlightenment.
Immanuel Kant said Enlightenment is man's emergence from his self imposed immaturity. It is self imposed because we often fail to think for ourselves without being guided by others.
"If I have a book to understand for me, a pastor to serve as my conscience, a doctor to decide my diet, and so on, I need not exert myself at all. I need not think, if I can only pay." Kant wrote.
What a fitting statement for our current state of eating and exercising affairs.
"Just tell me what to eat or do." I have heard this quote daily from clients for nearly a decade.
Kant would point out the immaturity in such a statement. I agree. Because as long as you need someone else to think for you, you will remain like a child.
I think it's better to learn how to make decisions for yourself to break out of the prison of immaturity.
Principles help you do that. The principles of nutrition and fitness are our Pillars. Every diet or workout program in existence uses the same ones. You could try someone else's combo on or you could learn them for yourself and create your own. The latter is enlightened, the former is not.