It is easy to make a delicious-looking hamburger at home.
But would this hamburger still look delicious after it sat on your kitchen table under very bright lights for six or seven hours? 
If someone took a picture or made a video of this hamburger after the seventh hour, would  anyone  want  to  eat  it? 
More importantly, do  you  think  you  could  get  millions  of people to pay money for this hamburger? 
These  are  the  questions  that fast-food  companies  worry  about  when they produce commercials or print ads for their products. 
Video and photo shoots often last many hours. The lights that the photographers use can be extremely hot. These conditions can cause the food to look quite unpleasant to potential consumers. 
Because of this, the menu items that you see in fast food commercials are probably not actually edible. 

Let’s use the hamburger as an example. 
The first  step  towards  building  the perfect commercial hamburger is the bun. 
The food stylist—a person employed by the company to make sure the products look perfect—sorts through hundreds of buns until he or she finds one  with  no  wrinkles.  
Next,  the  stylist  carefully  rearranges  the  sesame seeds  on  the  bun using  glue  and  tweezers  for maximum  visual  appeal.  
The  bun  is  then  sprayed  with a waterproofing  solution  so  that  it  will  not  get soggy from  contact  with  other  ingredients, the  lights,  or  the  humidity  in  the  room. 
Next,  the  food  stylist  shapes  a  meat  patty  into  a perfect  circle.  
Only the outside  of  the  meat  gets  cooked—the  inside  is  left  raw so  that  the meat remains moist.  
The  food stylist  then  paints  the  outside  of  the  meat  patty  with  a mixture  of  oil,  molasses,  and  brown food coloring.  
Grill  marks  are  either  painted  on  or seared  into the  meat  using hot  metal skewers.  
Finally,  the food  stylist  searches  through dozens  of  tomatoes  and  heads  of  lettuce  to  find  the  best-looking  produce.  
One  leaf  of  the crispest  lettuce  and  one  center  slice  of  the  reddest  tomato are  selected  and  then  sprayed with glycerin to keep them looking fresh. 
So, the next time you see a hamburger in a fast-food commercial, you must remember that you’re actually looking at glue, paint, raw meat, and  glycerin!