Alternate-day fasting in nonobese subjects: effects on body weight, body composition, and energy metabolism -- Heilbronn et al. 81 (1): 69 -- American Journal of Clinical Nutrition
The only study I'm aware of on the subject.^
I don't believe fasting is needed whatsoever. Why starve yourself on a bi-daily basis when you can simply monitor calorie intake instead? The general person has no need to go to such extremes. I'm Talking about fasting in regards to weight loss alone here.