Lettuce can be surprisingly tasty and filling! I've been consuming only some milk and FF yogurt each day and then a head or two of iceburg lettuce. By adding seasonings like Garlic & Basil or Mrs. Dash's seasonings or Grillmates and/or others, then by spraying a few squirts of "I Can't Believe It's Not Butter" on top---it can be delicious!
I eat with chopsticks always--slows me down and makes me concentrate on each bite.
Morning: little milk, a spoonful of yogurt
Afternoon: 1-2 heads of iceburg lettuce
Mid-Afternoon: sugar free gum and breathmints and diet soda
Evening: chew/spit whatever