The average person needs about 1,500 to 1,800 calories per day to keep alive, even if they just lie in bed and do no exercise. People doing very heavy work, such as an Arctic or Antarctic explorer pulling a sled across frozen trackless wastes, needs to eat about 10,000 calories per day. Even then, they have difficulty in eating enough food to get their necessary 10,000 calories per day. When Mike Stroud and Ranulph Fiennes crossed Antarctica on foot in 1992, they could eat only 5,500 calories each day. That's more than double the intake of the average person, but even so, they each lost about 23 kilograms in weight.
With Elvis, you can forget about your average 1,500 to 1,800 calories per day, or even the 5,500 calories per day of your average Antarctic explorer. Before he died, Elvis was eating about 100,000 calories per day! That's more than enough to keep your average multi-tonne Asian elephant alive - or, enough to keep you or me alive for nearly 60 days!
Can the human body even digest 100,000 per day? This article also says constant fidgeting burns over 3x more calories than running 10 km.
