The reason it can do this is because caffeine has the ability to increase the production of adrenaline and glucagon, hormones that trigger the release of glycogen from the liver and get energy from fat deposits. This, in turn, raises blood sugar and insulin levels and decreases the cells’ sensitivity to insulin. If we look at it closely we can deduce that the lowered sensitivity to insulin induced by caffeine is because of the increase of free fatty acids circulating in the blood, which the body now uses as an energy source.
The substance that causes the fat tissue breakdown is a metabolite of caffeine and it’s called paraxanthine. If you plan on targeting the stubborn fat specifically then you should focus on consuming caffeine before your training and it would have a greater effect if you drank it on an empty stomach.
One study has proven that consuming caffeine before your training can increase the fat burning potential by approximately 22% during the entire duration of your training. What’s even more interesting is that several studies have proven that the fat burning effect can be prolonged beyond the training itself, also known as the afterburner effect. Since caffeine is a diuretic it is important to drink a lot of water.
Caffeine’s diuretic effects
With is stimulant properties, caffeine increases both your blood pressure and heart rate which results in an increased blood volume. All this blood has to be filtered by the kidneys which in turn results in increased waste production. This, of course, means that a lot of regular coffee drinkers go to the toilet a bit more frequently.
However, the acute diuretic effect is only visible when one has consumed more than 250mg of caffeine. This effect does not happen with smaller doses of caffeine usually found in single cups of tea or coffee. Like any other stimulant as time goes by you will find caffeine’s effects diminishing due to the body becoming accustomed to it. Can the diuretic effect induced by caffeine be beneficial to fat loss? Even though you might find that there has been a slight weight decrease on the scale, loss of water is generally never considered an effective weight loss.