I came across this new report that investigates a unique protocol for fat loss. Researchers had two groups of overweight women perform different cycling routines. The first group cycled for 40 minutes at a regular, continuous pace 3 times per week. The other group performed a 20 minute workout (also three times per week), that consisted of 8 seconds of cycle sprinting, followed by 12 seconds of cycling lightly. Subjects kept repeating this pattern for the full 20 minutes.
The researchers reported that the interval training group lost 3 times as much fat as the regular group. It does not say how much weight was lost, but this is still a big difference across groups.
I am trying to get more details on this study, but in the meantime it is very thought-provoking.