The “Einstein test” (maybe not from Einstein himself) simply states that for a prophesy to be proven it has to be written down before the event happened, and that the prophet could in no way himself make the prophesy to be fulfilled.
You guessed it. This has led to a new fad: “The Daniel diet” consisting of only vegetables, or vegetables and grain, meatless diets or even vegan diets, but they all miss the point. The four young men decided to obey God and only eat kosher food rather than the pagan delicacies, and not drink wine, but trust God and drink their water. This act of obedience is what God honored.