How do I concentrate in school while dieting?

I am a college student who is trying to eat healthy and lose weight while restricting calories. I study EE which has lots of math and physics in it, so i eventually need some sugar and caffiene to concentrate for longer hours. How can I manage to quit eating sugards and caffiene. I do very well but I always fail when the first round of exams comes up.
Answer:
next time you feel like having sugar or caffiene drink a bottle or glass of water instead.i did it for about 3 months. i had no soda, (but had one cup of coffee each morning) and just ate healthy the rest of the day and counted my calories and i lost about 20lbs in 3 months. i also worked out a lot (weights and running) while going to school and work.just tell yourself to have water instead of sweets. or have a decaf tea or coffee, etc.

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Slowly ween yourself. Don't do it all in one day.

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I'm assuming that by sugar, you mean sugar like in candy, etc. Try eating more fruit; it's a good source of fiber and has its own natural sugars.Coffee is actually good for you, though I think you're not supposed to have more than three cups a day. Like the previous answer, try to slowly wean yourself off the coffee. And maybe start taking it black to also cut back on sugar.

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Simple sugar is aweful. Stick to low glycemic carbs, they will give you sustained energy. Have some oatmeal (not the instant kind) with some protein source.

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