Hi Doctor I Want To Ask A Question Please Read

Question: Hi doctor i want to ask a question please read my query carefully. Can the brain turn a thought into real to cause cancer? I mean when i think that if i do not do this (certain thing) i will get brain cancer, and i don't do it, did my brain turn the thought into real and cause damages and mutations in DNA and genes?? I ask this because i had a situation: i was sooo stressed at night and i wanted to eat something sweet and my brain told me that if i eat something sweet now and i am stressed i will get brain cancer (because i read that cancerous cells depends on sugar (even the studies showed that there is no link between that and causing cancer)), but my brain told me that if i eat this sweet sandwich while i am so stressed, the sugar in it will cause me DNA damages and genes mutations, and brain cancer. However i ate that sandwish. Can the thought turned to real? Can the cells in my brain understand the thought and react to it negativelly to cause brain cancer? Is there any possibility to the cells to interract with that thought? Do DNA and genes understood the thought and interract with it negativelly? Can the big amount of sugar in the sandwich cause DNA and genes mutations in a direct way when i eat it while i am soo stressed? Please doctor answer my questions! Can a thought be understood by DNA and genes and cells in the brain amd they interract with it negativelly in a way to cause mutations and brain cancer??? Is there any possibility for thay to happen in a direct way??? Do i need to do MRI test for my brain after several years from now?? Sorry to make this long doctor. Waiting for your answer.