Top researchers with international awards and recognition have all agreed that apples burn body fat.
A smart looking doctor enters a room. His garments and his outfit count towards credibility. He also targets a specific spectrum of the audience.
The doctor holds an apple, which links him to product he is promoting. The room is also covered in apples.
The doctor calls attention to the great researchers with credibility and respect so as to persuade the audience even more. He once again targets a certain spectrum of the audience to further the chance that they would get some apples.