Bud, vapes, Doritos and Mountain Dew is a uniquely Zoomer and American thing respectively, and stuttering predates high-fructose corn syrup, which is like invented in the 50s. The availability of sweets is no way as prevalent worldwide as it is in the US, also it is most the US that uses HFCS everywhere, whereas the rest of the world relies on regular cane sugar or the synthetic derivatives. I am a software engineer. The degree was mentioned to spare me with the information regarding the basic understanding of neuroscience. The sentiment about the genetics being immutable wasn’t even intended but you got there yourself anyway. You can’t change the blueprint but you still have the neuroplasticity in the brain, and that is just a fact and not a prescription.