Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Aerobic exercise and other Exercise topics.
Although you burn a higher percentage of fat calories at slow and moderate aerobic intensities, you burn more total calories, and more total fat calories, when you exercise at higher intensities. You may choose to work out longer and/or slower for various reasons, but never slow down just because you think that's necessary to be in a "fat burning zone."
A great answer to a misleading topic, the efficiency of fat metabolism. Bottom line, if your caloric intake is under control why worry about the type of calories burned. Burn as many as you can in the least amount of time, taking into consideration your health and fitness condition and goals.
what if somebody has a sickness that's making them not lose weight?
Well, less than .01% of the population is 'unable' to lose weight. The true culprit is actually the amount of food/drink you consume. Guaranteed if you stop eating and drinking you'll lose weight (but do not do that). It really is that you eat too much and do not exercise enough. My advice would be to look into personal training to get more help achieving your goals.