Food Photography - why does McDonald's food look different on their ads

Why does mcdonald's food look different on their ads ? I think that we all have wondered about this when we receive our burger and it does not look at all how the ad looks like.

Food Styilist arranges the ingredients. The main difference is that they spend hours arranging how they should look like instead of 2 minutes (The time apparently they need in stores) and put them all in the front. They use the same ingredients and arrange them in a perspective to show each of the ingredients that are included. We can only see one perspective that is why at the end it appears to have plenty of everything. Of course they use more for the photography but at least its the same ingredients.... Oh yeah, and a lot of photoshop.

Heres a video McDonalds released in order to answer this question to one of their consumers.
What do you think?