Dialysis is something that requires a certain amount of energy, and this amount is added to the regular amount of energy your body needs. Your physician will be able to tell you just how much more energy you need.
The most important source of energy for your body should be carbohydrates. Their main function is to store energy in your body. Some of the carbohydrates can be absorbed quickly, like those that can be found in sugar. Other, more complex carbohydrates take longer to break down, and thus provide energy over a longer period of time. They can be found in pasta, rice or brown bread.
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