Indeed, there is no better measure of personal taste than the food one eats. Literally and figuratively. What our presidents eat is a function family heritage, personal preference, physical condition and social obligation. In sum: a president's favorite meal is NOT always what's served in the White House.
The points apply equally to research talks, lectures, and non-technical presentations. 1  The average attention span of an adult is 20 minutes.  Implication: you should ensure that the first 20 minutes of your talk include any material that you want your audience to remember.
The average human's attention span is... oh look, a bird! According to scientists, the age of smartphones has left humans with such a short attention span even a goldfish can hold a thought for longer. Researchers surveyed 2,000 participants in Canada and studied the brain activity of 112 others using electroencephalograms.