Instead of 2 meals - stuff your face with a great big snack instead - a couple of doorstep cheese on toast, 2 eggs any way, a mahoosive salad with lots of tasty, salty things chucked in or Cereal/Muesli/Porridge tarted up with fruit and yoghurt, adding some extra milk at the end ekes it out whilst filling you up.
Forget mealtimes - just eat when you're hungry and wait, a bit before you eat, then eat. Set mealtimes is the root of getting fatter in our sedentary times, it's too hard for many to be able to burn off enough calories without being on a constant diet or factor in 'organized' physical activity.
Although I'm slimish in my late 50s, it's mostly because my work has always included a bit of physical exertion and family life has turned out not to revolve around the set concept of 3 Meals a Day.
I really do sympathise with the many people that diet to get slim when it's probaly just they're forced to spend too much time at their desks or too knackered at the end of each day to prep up a super-healthy meal to suit all each day.
Just give me Cake, is a pleasure/medication that we should all enjoy; without worrying about it making us fat.