The genetics of how many dopamine neurons you formed, mediating anticipation and reward. The genetics of how much pictures of appealing food activate those neurons when you’re dieting. How intensely stress produces cravings for high-carb/high-fat foods, how aversive hunger feels. And of course, how readily your frontal cortex regulates parts of the hypothalamus relevant to hunger, bringing in the ever-present issue of willpower. Once again, both sides of the chart are made of the same biology.
