Probably not much. But really think back on your training arc in the past. When I am in my training phase doing krav-maga, lifting weights, biking... yeah, I

Probably not much. But really think back on your training arc in the past. When I am in my training phase doing krav-maga, lifting weights, biking... yeah, I need thousands of calories to feel healthy (I never really counted how much). But immediately after (assuming the muscle you built is not just inflated and is comprised of lean strength), I have personally found I can get away with very few calories/day for several months.