Protein Shake/Bar

Hi Brooke,
I’m not an overeater, if anything I’m an under-eater. Wine is more my thing, but I digress. I’m confused about protein shakes/bars. I’ve been told to never ever eat a protein bar unless I’m starving and there is nothing else. Re: the shake, I usually drink one for lunch after working out and this is my first “meal” of the day. Sometimes I’ll eat an organic protein bar instead (which totally tastes like sawdust). Just wanting your thoughts. These things are quite expensive so if they are not wise or necessary, I can ditch them.