You are a runner. Fasting and limited carb consumption is not optimal for your training regimen. I suggest you take a look at the PHD diet, that is a Paleo version that emphasizes starches, such as sweet potato and white rice in addition to the Primal selection of meats, vegetables and fruit over fat content. My mother who is an avid biker and hiker, had fantastic results with it for both overall fat loss and belly fat loss (she basically lost her 20+ years gut in 6 months going from ~ 150 lbs to 120 lbs at the height of 5'6"). Unless you have diabetic or pre-diabetic condition, give a try to reducing fat and adding a serving of a safe starch with every one of your 3-4 meals a day, starting with a breakfast right after your run (if you run the first thing). A nutritional breakfast >> coffee for health and wellness imo. Also, supplement a LOT with home-made beef bone broth.