It is tempting to think that your diet is what makes you fit, but that's just an excuse. I'm fit because I exercise intensely every day. Whether I'm eating beans or steak doesn't change that.

I've only heard this idea from people who aren't in shape obsessing over all the details of the body except for the one that matters: having the discipline to exercise.

It's like debating whether you should have celery or its close cousin, rhubarb, while skipping your daily run.