If you are the partner of a breastfeeding mom, you will likely notice something about her appetite: she often doesn't pay attention to it until she is starving! Here is my solution:

THE 3 BOWL RULE
Don't ever walk away from a breastfeeding mom without providing 3 bowls of food choices. Go get 3 small bowls and fill them with things she can live on (that your dog won't eat). Nuts, seeds, trail mix, cut up fruit, berries, baby veggies, hummus, nut butters and crackers, etc. Fill the bowls each time you walk away, knowing she will have nutritious foods beside her even if you are sleeping, showering, working, or just walking the dog.

This stuff doesn't seem important until she is left without food and the starving starts. Then you will thank me that you used the 3 bowl rule. :)