nutritional balance and getting enough calories

Newbie here, into my second week. One of the ways I'm making better choices with my eating is cutting back on starches, as I heavily increase fruits and veggies. I think this is good for me overall, but I'm wondering how it fits in with the nutritional goals set by MFP. I find that I don't always make my 1200 calorie/day goal, although most days I come close, and occasionally I meet it. I'm usually around the 950-1050 mark. I know it's important to not go into starvation mode, but when I increase what I think I should increase, like a serving of walnut for omega-3s, for example, it gets my calories up, but pushes my proteins way over. It's not like I'm eating a heavy protein diet. 1 cup of oatmeal in the morning, and usually throughout the rest of the day, 3-4 oz of chicken, 1-2 servings of milk, 4 tsp. peanut butter or an oz. of walnuts, and then the amounts that come in spinach and the occasional yogurt. Seeing those red numbers in my diary summary at the bottom just kinda freaks me out, I guess. Should I ignore them? Should I/Can I adjust them? MUST I increase my starchy foods?