The fat burning zone is actually very misleading. While it is true that proportionately more energy will come from fat during lower intensity workouts, lower intensity workouts don't burn all that much.
So while a "fat burning zone" workout might burn 300 calories per hour, with 60% coming from fat (= 180 fat calories), a more intense workout might burn 600 calories in an hour, with only 40% coming from fat, but more total calories means that this 40% still burns 240 fat calories.
But the real truth is that where energy is coming from during your workout is irrelevant to fat loss. Your body has several different energy systems, and will balance between them to meet your energy needs throughout the day.
What matters for fat loss is the overall balance between calories burned and consumed over the ENTIRE 24 HOUR DAY. If you run an overall calorie deficit, then the body is going to have to tap its fat stores to make up the gap at some stage during the day, regardless of where energy is coming from during your workout.
From this perspective, if fat loss is your goal, you are better off working out more intensely and burning more total calories.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0