You can sustain your body with plants only, but it is a meager (physical) existence. If you want robust strength in the body, you have to feed it the food it was designed for. If you're going to sit in a cave and meditate, the plants are fine.
You can sustain your body with plants only, but it is a meager (physical) existence. If you want robust strength in the body, you have to feed it the food it was designed for. If you're going to sit in a cave and meditate, the plants are fine.