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After a long time of hard workout,not eating and nervousness makes your taste and scent of mouth very uncomfortable and bad why this happens and is there any way to prevent it?

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This is caused by a build up of ketone bodies in your blood which lowers the pH of your body and can cause bad breath. Ketone bodies are a response of your body breaking down fatty acids for energy instead of glucose when in a low food intake (fasting) state. This is also true for morning breath since your body has been in a fasting state. The way to prevent this is to eat the proper amount of calories needed for your body to function normally.

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