The fat on that day definitely came from the peanuts, remember that at 600 cals/100 grs they add up quickly. Is there a wy you can take a chicken breast sammich with you to work and eat it quickly wheny you get the pawn of hunger? A bar is not ideal, since it has too many carbs, but a breast in a quaility whole grain bread would be good.
Try to keep the fats at about 30% of daily cal intake (as a max level)... if you are lacking cals during the day, fill them in with some lean protein (a can tuna or a chicken breast) and some quality carbs (a glass of oats, even if instant, a good bread, or some veggies).
Fats are ok, but so caloric dense that they add up too quickly. As long as you don't mix them with your carbs you will be OK.
Come on girl, push for those 1500 cals/day...