Which of the following is not a step one can take to prevent food borne illnesses?
a. cooking foods to an appropriate temperature
b. refrigerating food within two hours of preparation
c. cutting all meats with the same knife
d. keeping ready-to-eat food separate from raw food

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.   

Answer psychoneuroimmunology;

One health risk and the most important one is obesity, it can cause obesity since you are not leveling your food like you wont ever get full because your just snacking between foods which can also cause diabetes.hope this : )