Not getting solid sleep 8-9 hours a night and overtraining are certainly not going to allow your body to drop fat. It’s also related to stress and cortisol. For marathon training, you should have read Phil Maffetones work about training slow and building a solid aerobic base. This takes time, but is easy, safe and sensible. Faster running, higher heart rates and ALL weight training are “anaerobic” and tend to born more sigars and less fat. Don’t trust me, train the world class endurance athletes he has trained who did not believe it when they started either. Sometimes less is a LOT more and No Pain No Gain is actually a very health damaging myth.
Several studies concluded that diets low in fat (under 15% of total calories) significantly decreased testosterone levels while diets higher in fat (above 30% of total calories) increased serum testosterone levels. Rather than continuing with this discussion I will provide a link to an article which covers the subject quite nicely. To simplify everything that I have said, it seems that one should not lower fat below 15% of daily calories unless they would like to face extreme testosterone deficiencies. Likewise, one should not increase fat to say 40% in order to increase testosterone. Although fat increases testosterone to a degree, it is important to remember that testosterone is only a small piece of the larger puzzle. There are many other hormones and factors involved in building muscle other than just testosterone. By increasing fat to extremely high levels, there will be less “space” for carbohydrates and protein, both of which are very important for aforementioned reasons.