exercise/food question

this probably seems like a stupid question, but it threw me this week.

I work from 9-5.  I get home around 6 pm, and I want to take a Zumba class from 7-8.

Normally, I eat dinner around 6:30-7.  So, Monday, I wanted to eat something before class, but not too much because I didn't want to eat and then bounce around.  I did have a sandwich.  I did the class and then felt FAMISHED!!!  I don't think I've ever been so hungry since surgery.  I ate another meal -- and felt enormously guilty.

Suggestions for next week?

I would say, try putting you afternoon snack off until later on that day or maybe have half a banana or something that will hold you over.  When I had a PT, she said, a good carb along with a little protein (like half a banana and peanut butter) an hour before working out is good; and plan your dinner for afterwards. . .  as we should have protein within an hour after working out, particularly when doing weights. 

Oh and make sure you've had a good amount of water, especially doing a Zumba class. . . 

Try something with a little protein and some fluids about 45 min. before class and some more fluids right after class. Since you are going home to eat dinner the liquids should hold you.

 I injured my left knee 4 wks ago.  I am in a leg brace.  HOW do I exercise when I have to keep my left leg immobilized??  Since I injured my knee, I have gaine back 4 lbs which is a major bummer for me. 

Anyone have any solutions???