Daf 41. Summary. The rabbis debate which blessings are mandated when there are many types of food– does one focus on the primary component or the one the blessor most wants to eat?
Some portions of food and/or the time it takes to eat them are benchmarks to indicate ritual impurity or obligations to recite blessings.
A blessing over bread eliminates the obligation for additional blessings of foods that are integral to the meal. Wine is different.