When you burn fat is it the latest fat you stored from eating that gets burned or is it totally random?
In: Biology
When you eat fat, you are eating another animals fat (or a plants fat) this doesn’t become your fat. You digest the fat by the action of lipase enzymes, that becomes tryglycerol and fatty acids, which becomes glycerol, which becomes pyruvate and then gluconeogenesis causes it to become glucose. This enters the blood, your blood sugar spikes.
These products are broken down by various chemical reactions in the stomach/intestines, enter the blood, when blood sugar spikes after a meal insulin release tells the body to start taking glucose from the blood – the muscles, liver and fat cells then take this from the blood and store it.
When your body uses energy during exercise, it uses the energy already in the muscles first and when the energy in the muscles depletes then that comes from the blood. Which causes the energy in the blood to drop, which then causes the release of glucagon, which has the opposite effect of insulin and pulls energy from the stores of energy in other parts of the body.
Because there are so many different metabolites, waste products, nutrients etc that come from each bit of food that you eat, I would say it’s impossible for anyone to track where a fat molecule in your body came from – so I don’t think anyone really knows the answer to your question
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