Most of our food produced and wasted is never registered in any statistic so a real number on the actual amount of waste is undetermined.
The product, fresh, nutritious produce left in the fields. The reason, choosy grocery shoppers, there has become this market standard for the way our produce should look and that relates to its flavor. Think of it like supermodels and magazine ads, we as a society believe by being skinny without any blemishes will make us successful. And we strive to look like the women and men in those ads. Now, look at the picture of tomatoes, which was published in a story from a LA paper. If I was a novice produce shopper I would see this picture and believe that this is the way all tomatoes should look (even the alien head in the second row!).
Farmers and machine companies have gone as far as making farming equipment that only picks tomatoes within a certain diameter and weight range, leaving all ugly ducklings on the field. Perfectly good and flavorful tomatoes that can be repurposed into flavorful products such as marinara or salsa. This is the idea behind Quinces Preserved, a company that buys up unwanted produce from farmers and backyard garden enthusiasts. Helping to lower the food making it into the landfills.