How odd! My weight always goes up spring to early autumn and yet I def eat a bit less and do more. But I think that is cos I feel the cold so in winter I am using a lot of calories just to try and keep warm? Could be. But you must be sleep-walking and raiding people’s fridge’s every night!!

If you weren’t generally so active I’d say that your muscles were holding onto water due to the shock of sudden exercise*.

Four pounds over the course of four days would suggest an excess consumption across the period of over 12000 calories**. Surely you’d need to eat a portion of fish and chips for every meal to achieve that, with some chocolate bars in between – which again points to water weight. It’ll be interesting (kinda…) to see if it disappears again in a couple of days.

(*disclaimer 1: I may be talking utter rubbish here. **disclaimer 2: I know that the 3000ish calories = 1lb weight is commonly accepted but did read a paper that put forward an argument that it was groundless)