I get it too. Some days - usually for a period of a few days at a time - I need to,eat silly amounts of food to keep my sugars up. I've also noticed that when I have a cold, my sugars stay low and need lots of food. I used to wonder if the cold distracted my immune system away from my islet cells briefly : D
Interestingly, I also need to,eat large amounts of carbs to do,gardening - even a few minutes of very, very gentle weeding. I thought this was some daft thing that affected just me, but at a clinic some years ago, I met a Type 1 who,said he found that too. He surmised it was the action of bending over and that that might stimulate the pancreas in some way. I don't know about that, but I've noticed it so many times and even done multiple blood tests and carb counts to prove it, so it's definitely a real effect whatever the cause.