This is a strange question as one could just answer "poison" if they were so inclined. For food, however, it's hard to narrow down to one particular food. I'd say something along the lines of "cool whip", because it contains HFCS and hydrogenated oils. When these two things are combined and consumed you have trouble.
There are many types of food that are unhealthy, but there really isn't a "most unhealthy" food.
One of the most unhealthy of the food myths is, 'more is better'.
unhealthy food means food that is not good for you and have too much fat
Sugar
Not sure what you mean. NO food is unhealthy. What is unhealthy is over indulgence in any particular type of food. Over eat and you gain weight with any resultant health problems.
Unhealthy food have more sugar and its good, but healthy food dont have as much sugar and it tastes plain without sugar.
china consumes the most food, they even bring it to America (Chinese) food, they are unhealthy but i think china consumes the most
A big mac
No, its not unhealthy.
caned food and pre made food
As with most prepackaged junk food, they're not healthy for you. At all.
cuz unhealthy food tastes better