That's one of the reasons that people who make modulating their body composition a key priority (bodybuilders) often stick to very consistent diets. By not varying the type, quality, and preparation of the food, they can modulate quantity for desired effects (bulking, cutting).
Yep, my diet is ridiculously consistent. I cook my food in bulk (saves time and money), drink lots of protein shakes, and when I eat out I usually order the same foods. My typical weekly meal list probably contains fewer than ten items that I switch around. Most of the variety comes from experimenting with new zero-calorie ingredients like condiments (e.g. cinnamon) and salt/pepper.
