Suppose you eat and sleep well, but your training is inadequate. As a result, the growth stimulus is missing because you are not stimulating your muscles sufficiently.

If your diet consists of low-quality food, your nutrients suffer. The nutrients that your muscles and body need are missing. You might be exhausted for longer, and your muscles grow sluggishly, if at all.

Without enough regeneration and sleep, you cannot make optimum use of the valuable preconditions of the right training stimulus and proper nutrients in the bloodstream.