Dr Zack MD on Instagram: "I need people to understand how dangerous “mathematics” and “Coca-cola” really are—especially right now. Both of these substances put extreme stress on the heart, brain, and blood vessels. They can cause sudden cardiac arrest, strokes, dangerously high body temperature, and fatal heart rhythm disturbances—sometimes on the first use, and sometimes after years of use. There is no safe dose. One of the biggest dangers is that people don’t realize they’re overdosing until i