Our expert says:
I don't think it will - losing 3 to 4 kg in one week is a lot, yes, but it's not all "physiological" in that the time frame is too short for it to have longer lasting effects on your body. A lot of it will be water loss, actue weight loss that will immediately correct itself. So I think you'll find that your metabolic rate, which is one of hte main determinants of weight loss, will be unaffected.
Given that you have 20kg to lose, I think it's important to be thinking long-term, to give it time and realise that the last week, while not ideal (from a stress point of view) is not going to make or break your success.
So stick with the long term plan, you'll be OK. Obviously, the smoking and stress are unwelcome, and have to be dealt with, but don't worry about your body - this is a long-distance race, not a sprint, so be patient and get back into the groove as soon as you can!
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