Info from the Smoothie King Lunchtime Survey: Some 58 percent of Americans skip lunch - and one-third of those who did not eat lunch expressed feeling tired or moody. Also of note, one out of five had difficulty concentrating or thinking. And omitting the midday meal can inflate the waistline. Many lunch-skippers admitted overeating at the next meal or eating unhealthy. On a final note, 43 percent of the 18 to 54 year-olds questioned regarded lunch as the least important meal of the day, nutritionally.