If the infographic's a little hard to read, here's an abbreviated step-by-step:
First 10 Minutes
Your body's blood sugar elevates to abnormal levels, courtesy of the burger's 540 calories, and "feel-good" chemicals like dopamine get released. (Sudden desire to listen to Guns 'n Roses not specified, but probable.)
After 20 Minutes
The large quantities of high fructose corn syrup and sodium present in the Big Mac's bun trigger an addictive response in your brain, leading you to crave more.
After 30 Minutes
The sodium's not done yet, folks: those 970 milligrams of salt bring on symptoms of dehydration, which closely resemble those of hunger, leading you to believe you need even more Big Mac in your life. To make matters worse, your kidneys are forced to work even harder to process all that salt, and the corresponding heart rate increase leads to higher blood pressure.