Building muscle and waterfasting?

Right a quick quistion if I went and built muscle over a period of 4-6 months gaining 4000 calories for example if I went on a waterfast 30 days on 30 days refeed then 2-3 weeks 2500 would it be possible to after that period to go to 4000 calories the reason I ask the refeeding period a woman's heart exploded due to putting too much weight on the refeeding period thank you.