What happens with fats after exercise?

[Frigorifico]

I know that we use fat and other molecules to store energy, and that during exercise we use that energy.
I understand that we use that energy by means of a chemical reaction that, among other things, transforms fat in something else.

What I wonder is: what is fat ultimately transformed to and what does the body do with it?, my guess is that is throw away in the urine.

Thanks a lot

 

[Borek]

Carbon dioxide and water.

It is not that much different from burning, just through another pathways.

 

[epenguin]

Yes, that's frankly an every schoolchild knows question and answer. A proper answer of how that happens is several chapters of a biochemistry book, so too generic for here.

Since you did come here I'll tell you something not everybody realizes - the water mentioned by Borek can be important. For instance the hump of the camel is a store of fat not water, and oxidising that gives it the water it needs to see it through its waterless times.

 

[boymilk]

Energy is released when fatty acids are oxidized. We could oxidize fats by literally burning them and this would release energy but our bodies use a complex series of enzymes to achieve the same goal. Excluding transport, the first part of this process is called beta oxidation and happens in the mitochondria. It's a complex process but to put it into very simple terms, the fatty acid molecule is broken down to generate molecules of acetyl-CoA. The acetyl-CoA molecules then enter another cycle called the citric acid cycle where they are are further oxidized to carbon dioxide. This generates NADH and FADH2. NADH and FADH2 are then used in the electron transport chain to produce ATP, the energy currency of the cell.

The actual process is much more complicated and involves many enzymes and multiple reaction steps. Here is a slightly more detailed (but still very simplified) explanation:

http://www.biocarta.com/pathfiles/betaoxidationpathway.asp

Oh, and a fat molecule is basically glycerol and three fatty acids. The glycerol portion can be converted into glucose for fuel while the three fatty acids undergo beta oxidation as mentioned above. Wikipedia has a very detailed explanation of all of the steps involved from start to finish. A college textbook would also show the individual steps - but with significantly less detail.

 

[LudusRex]

for your question. After exercise, the body goes through a process called post-exercise fat oxidation, where it converts the stored fat into energy. This energy is used to fuel the body's muscles and other cells, helping them to recover and repair after the physical activity.

During exercise, the body uses a combination of stored fat and carbohydrates to provide energy. As the intensity of the exercise increases, the body relies more on carbohydrates for energy. However, after exercise, the body continues to use stored fat as the primary source of energy as it works to replenish its stores of carbohydrates.

The process of fat oxidation involves breaking down the fat molecules into smaller components called fatty acids and glycerol. These fatty acids are then transported to the muscle cells, where they are converted into a usable form of energy through a series of chemical reactions.

The energy produced from fat oxidation is used to fuel the body's daily activities and to maintain essential bodily functions. Any excess fat that is not used for energy is either stored for later use or eliminated through the body's waste systems, such as urine and sweat.

It is important to note that the body does not simply "throw away" fat in the urine. Fat is an essential nutrient and is needed for various bodily functions, including hormone production and insulation. Therefore, the body only eliminates excess fat that is not needed for these functions.

In conclusion, after exercise, the body uses stored fat as a source of energy, converting it into usable energy through a process called fat oxidation. Any excess fat is either stored for later use or eliminated through the body's waste systems. It is important to maintain a healthy balance of fat in the body to support overall health and well-being.