My PCP in Philly from a few years ago was kind of an idiot, and I don't guess that he succusfully reduced very many patients. He was one of those guys that tried to steer me away from what I was at the time referring to as an "Atkins" diet, towards a diet that consisted of "low calorie density foods", such as salads.
Now, I think the first half of that, steering away from low-carb nutrition is patently stupid. However the second half of that, "low calorie density food" has some merit.
My dinner tonight was two cajun-spiced, reasonably small but tasty chicken breasts. The only reason that this meal was satisfying is I pretty much also ate a whole head of steamed broccoli with it.
I love broccoli so this wasn't a chore. If there is something you like that is similarly green, fiberous, grown-above-ground, and tasty, then I would recommend mixing it in with your source of protein, fat, and calories.