Which of the following is not true about the effects of exercise on muscles?
a. it increases muscle tone.
b. it adds material to the outside of the muscle cells.
c. it increases the efficiency of the heart.
d. it can cause muscles to visibly increase in size.

The answer that is correct for this question is C!! 

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Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )