It’s the absence of the methyls. Remember your partitioning and utilization is actually down, so you don’t need more cals than you were getting to maintain.
Baby carrots, cucumbers, cherry tomatoes, pickles, broccoli & (bleh), spinach salads, celery stalks - eat these freely!
Also, reverse the bulking food prep mentality - make food more voluminous and filling. Avoid adding calories from things like dressings, mayo, bbq sauce, cheese & opt for low cal sauces like Old El Paso taco sauce, Frank’s/Louisiana hot sauce, mustard, low-sugar ketchup, G Hughes bbq sauce, soy sauce.
Riced cauliflower comes in easy steamer bags and you can mix some into your rice, or use baked potatoes instead of rice entirely is even better (especially with I can’t believe it’s not butter spray & plain Greek yogurt on it). Buying leaner ground meat if it’s affordable or even going to something like chicken breast if you are really starving can be an option. Scramble your eggs and add some whites if you need more volume.
Lastly, add some steamer bags of asparagus or greenbeans to meals. Or canned green beans, unsweetened beets, sauerkraut. That extra stuff isn’t going to make you fat.