Do you know why you are going so low? Do you get all if not most of your GHGs (good health guidelines) daily? It is generally recommended that you hit your daily points, I'm not sure of the exact number- I think it isn't more than 5 under a day is okay but 10? That isn't good. Why isn't it good? To be honest, I'm not sure exactly but I guess because it may cause you to stall and miss some nutrients that you need to get if you're eating so low.
Do you eat a lot of fat-free/low fat kind of stuff? If you do, maybe go with the full-fat versions from time to time for one meal and/or a snack. Natural nut butters and nuts are great. Like salads? Put a bit of olive oil or whatever oil you like on top of it (or toss the veggies around, etc) or mix it in with a homemade dressing/vinaigrette then add to whatever you like.
That's all I can think of right now (at 3am) and if I think of something else, I'll come back and add.