With some people it’s about the amount of food in the beginning. It happened to me too, but I considered it a substantial benefit… I can’t really describe it, I was stuffing myself like mad and I have not gained any weight. But this does not last forever 🙂 It’s necessary to increase input and decrease output, which can be done by eating a lot and resting enough. If you burn everything right away, it becomes much more difficult 🙂