In a very reductionist way, we can look at what we eat as having an effect on how we look.  What we eat absolutely does play a role in what we see in the mirror, and it's great if we acknowledge that (some people actually don't), but it doesn't stop there.

What we eat can affect our mind.

What we eat can affect our ability to concentrate.

What we eat can affect our energy levels.

What we eat can reflect on how we feel about ourselves and how much we value ourselves.

What we eat can drain financial resources and limit our ability to invest in other areas of our life that we want to improve upon.

What we eat can influence who we spend time with.

The list goes on and on.

It doesn't stop with just what we eat.  Plug in any category of your life, and break it down just as we did with nutrition, and you will see how it all ties in together.

Do we need to always be thinking about this?  Absolutely not.  That would make us miserable.

But, understanding and acknowledging it is imperative as we continue this journey of always evolving.