This link is for a technical paper which is about six pages long. It is not necessary to read the whole thing to understand it. The beginning of the report explains the methodology while the second half of the report gives the results. Most telling in this report is that young children even thought carrots tasted better if they came in a McDonalds wrapper. There was also a direct relationship between TV watching and the prevalence of eating at McDonalds.
McDonalds was chosen because they are the industry leader however these results, I am certain, cross over to others, such as Burger King, Taco Bell, etc.
Think your kids aren't being manipulated by TV ads? Read these results and you decide.