Why do certain foods cause malodorous gas?

Hi everyone. I did not sign my name because I'm WAY to embaressed to ask this with my name. But here it goes. Why after you eat "no-no" foods like fatty foods or candybars you have gas. Not only do you have gas, it smells something terrible. Why? Also, the same with your bowel movements. They smell something terrible if I eat those foods. Can someone please explain these embarrising questions to me. THANKS!!!!

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