I was eatin it outta the can with hot sauce, washin it down with milk and an apple. It was self-contained and mindless, completely miserable portioned eating. But I never saw weight fall off my body like that. And I never got frail lookin. Just more muscular and carved up.
So I advocate the effectiveness of replacing meals with fish when you can, but God knows, I absolutely despise the taste/smell/experience of tuna.