zlacker

Even questionable quality ground beef is almost always a better option than most carb-centric nutrition sources. It freezes well, transports is broadly available and can usually be ordered for delivery.

Eggs, aside from some of the disease issues are also a very good, nutritionally complete source of protein that are relatively inexpensive.

Another issue is that people have been conditioned to eat/snack all the time... a lot of people have moved towards 2-3 meals a day which is closer to historical norms... have protein be your main source, with vegetables as a side, and maybe bread/pasta at some meals.

There are also beans/legumes if you can tolerate them.