Protein, starch, and fat molecules do not enter the process of cellular respiration. Please explain this statement to me.

Dear student,      
​Please find below the solution to the asked query  

The digestion of starch results in the production of  glucose, the digestion of proteins results in the production of amino acids and the digestion of fats result in the formation of fatty acids and glycerol. It is these digested products which enter the cellular respiration and the  respiration of glucose and protein results in the formation ATPs and NADPH.  
Starch, proteins and fats cannot enter cellular respiration pathway directly as they are large molecules which can only perform respiration once they are broken down.

Hope this information will clear your doubts about the topic.   
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i dont know
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Because cellular respiration does not need these things for breathing in body.
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not needed for the respiration
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Thanks for responding. but i require more details. Experts help please
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