Just Google for it from an incognito session to get the full article. I quoted the gist of the research in the other post but here goes: Because there's a limit to how much a human body can eat a day, body also regulates how many calories the body can burn in a day. So you can do one day where you burn more than 6000kcal but any more days and 6k is the rough limit, even if you run a full marathon. Body adapts, but it also doesn't let you burn too many calories over consecutive days.