you should definitely be eating more, but the fact that you are hungry 2 hours after a meal seems more problematic to me. what exactly are you eating? you may want to up the fats/protein and lower the carbs a bit.
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway