Has anyone else experienced moderate to severe depression while restricting their calories? I've lost a lot of weight and am trying to keep it off and possibly lose a little more, but these days the more I cut my calories the worse I feel. Yesterday I ran 12 miles and took in 2000 calories, but by the end of the day I was really down. This is a pretty predictable occurrence - any time I run a lot distance and I don't eat more than usual, I get really emotional, sort of like when I have low blood sugar (which could very well be the case, I suppose). Has anyone else felt this? What do you do to fix it, just eat more? I'm wondering, too, if it's not a lack of calories but rather a deficiency in something else. I've read that in low fat diets sometimes you lack EFA's, but I don't really know where to get those except for flax seed and walnuts... A little help?