The simplest way to introduce mindful eating to the people in your life is to explain that mindful eating means eating with awareness.
Mindful eating is a choice. You can choose not to do it. However, if you do so with awareness and choice, you are making a mindful decision.
how long will it take to become a mindful eater? As soon as you take your first bite of food with awareness, you are mindful eater.
If you were to do one thing to promote mindful eating, what should it be? In a word—Meditation.