On a single day I probably did take in about 7000 kJ when I was very active and did work physically. When I was climbing mountains I estimated I did eat about 10.000 kJ on a day. When I would do that on normal days on a regular basis I would die after a few months probably.

I once calculated my energy consumption when diving doing two dives of an hour duration per day. It is about the same as if jogging for 2 hours. That's about 5000 kJ extra per day. A woman of my age and weight might usually need 2500 kJ basic energy supply per day. So diving is a fat burner. As my energy supply must increase almost threefold while diving. So basically I could eat those 10.000 kJ per day without problems. Especially if a part of them is provided by means of beverages, preferably beer. haha!