I don't pack all my meals, too big of a hassle, but I do bring fruits and veggies for snacks. I work out consistently so I actually eat a fair bit too.. not one those folks who can survive all day on a single homemade quinoa salad in a tupperware.
These days I just drop the coin on healthy food, using delivery services if necessary.
If you're at one of the regionals that pays less than $100K, and don't want to spend the money on the road you can still pack your own, just takes effort and a bigger bag.
But either way it's worth it in the long run to east healthy.