What are some foods that give you a lot of energy for work?

Anonymous
and what exercises can make me stronger? I feel really weak when I'm at work, I work in retail and its not even that hard, but I don't know why I feel so tired and no energy, my legs are soar, I have to go to physical therapy for my knee I don't know why its been impacted, and I just feel like crap. how can I lose fat off my body and make myself more stronger and powerful? I get random headaches too sometimes, I just feel like a weakling...its pathetic. I'm 23, I had so much more energy and speed when I was 19-20 so I don't know what's happened to me.

pls help!
What are some foods that give you a lot of energy for work?
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