It's a book by a online fitness trainer called Jordan Syatt, it's called "Eat IT!" I'll report back when it comes. If you haven't come across him, He's a good guy, and I've benefited greatly from his content the last few years, decided to support him in a small way in the hope it'll help me too.
No you couldn't have gained 3 real pounds, don't sweat it, it'll be gone in a day or 2. I definitely gained a good 7lb, I've done the maths. Yes I did eat that much 😂 I'm choosing to believe the extra 3 is airplane bloat and it'll be gone by Wednesday. The 3 that is, the 7 have come for their summer hols...