Yes, they do! Quite well in fact...
You know those pesky last 5-10 pounds that are SO hard to get rid of… Well, think of fat burner supplements as the final 10% of your artillery used in the fight against fat.
Let’s say that diet is 70% to 80%, exercise is 10% to 20% and fat burners are that final 10%, the final weapon being brought into the play to support all of your persistence and hard work to maximize the amount of fat loss that your body achieves throughout the fat loss period of your training.
The term 'fat burner' is used to describe nutrition supplements that are claimed to acutely increase fat metabolism or energy expenditure, impair fat absorption, increase weight loss, increase fat oxidation during exercise, or somehow cause long-term adaptations that promote fat metabolism. Often, these supplements contain a number of ingredients, each with its own proposed mechanism of action and it is often claimed that the combination of these substances will have additive effects.
First lets look at 2 terms that are often associated with fat loss or weight loss and fat burners. These are two of the main ways that fat burners work in your body:
Thermogenesis is a metabolic process during which your body burns calories to produce heat. Several factors induce thermogenesis in your body including exercise, diet and environmental temperature. Thermogenesis can promote weight loss because it increases your body's calorie burn. Although inducing thermogenesis can help you burn more calories, a low-calorie diet and regular physical activity are the best ways for you to lose body weight
Lipolysis is the breakdown of lipids and involves hydrolysis of triglycerides into glycerol and free fatty acids. The following hormones induce lipolysis: glucagon, epinephrine, norepinephrine, ghrelin, growth hormone, testosterone, and cortisol.
During this process, free fatty acids are released into the bloodstream and circulate throughout the body. Lipolysis can be defined as the process in the body of breaking down stored triglycerides (or triglycerides in the blood for food we've just eaten), into two main components, glycerol and fatty acids.