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I've definitely got booze/pizza weight to shift. The calorific deficit number comes from a quick google - 3500kcal per lb/7700kcal per kg of fat - it's nice to have a vague quantity to be aware of, and I think I'll get about 3-5k calorie deficit out of running, and then cutting back on the crap in my diet should get me an extra 2-3k . Even so, getting fitness back is more important so if I'm struggling I'll just up my calories so I can train anyway. The weight will go back down eventually.
With such a short timeframe I just have to give it a bash and see if it works. Probably too short a window to try and adjust things - but if it does go well, I'd like to keep it on for a bit. That being said, dieting through winter is rough.
Also judging by how quickly the weight has dropped in the first few days gives me a bit of a cheaty head start (and suggests that my high point was inflated due to a very heavy pizza session the night before!).
Is that right? Seems way too high to me. Lots of running and calorie deficit and likely your body will lose muscle mass over fat (depending on your starting point). But I'm not an expert.