Who has gone through a brutal workout and felt hungry after?
Post workout recovery is crucial to progress, and post workout nutrition is key to recovery. Workouts put a lot of stress on the body both externally and internally. Being hungry and thirsty is your body crying for replenishment. That heavily soaked t-shirt you just threw in the hamper, it's full of sodium and other nutrients.
We are extremely busy, heavy work loads and extra curricular commitments leave little time to prepare wholesome meals. Therefore, people often rely on the first thing they see. In our case, Carls Jr, which is terrible. In a perfect world, we would all get the necessary nutrients from real food. Unfortunately due to multiple circumstances, it is not possible.
That is where supplementation comes in. Going back to post-workout, it is essential to replenish your body with the fluid it has just lost. Hydrate, hydrate, hydrate, it is as important to drink water post workout as it is before and during your workout. Your body is begging for it.
On the performance side, it is important to get some form of Protein in your system, whether it is whole food rich in protein (Chicken breast, egg whites) or a protein shake.
breakingmuscle.com is great resource on this topic and recently wrote a solid piece on post-workout nutrition. As always, this is a mere suggestion, so if you plan on stopping at Carls Jr, make it a Turkey Burger (No sauce, no cheese, no bun).