Fat Metabolism | How Fat is Digested and Burned: Thomas DeLauer

Fat Metabolism | How Fat is Digested and Burned: Thomas DeLauer

Fat Metabolism | How Fat is Digested and Burned: Thomas DeLauer

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hey everyone is Thomas de Lauer and I’m going to take you back to biology class for a little bit and make an entry level and make it super simple so that you know how much fat you can have in one sitting but before you know how much fat you can have in one sitting you need to understand a little bit about how fat is actually absorbed in the body so I’m going to break it down let’s take a little ride on consuming some fat all the way through the mouth through the intestinal tract and into the bloodstream from soup to nuts on how this whole thing works you see it all begins as soon as you take a bite of something with some fat in it see lipase starts the process of breaking down fats as soon as it hits your mouth but then goes into your stomach and it starts to break down even more okay and it all happens because of gastric lipase and pancreatic lipase which I’ll explain in a second you see fats are made up of three fatty acids bound to a glycerol molecule okay so they’re bound together that is known as a lipid so then what happens you consume that lipid your stomach breaks it down about ten percent okay so ten percent just a small amount and that’s done by gastric lipase what that does is that takes those three fatty acid molecules that are bound in the glycerol and removes two of them so two of them are now gone and you’re left with one individual then the next step moves on into the small intestine once it moves on into the small intestine there’s something else called pancreatic lipase that kicks in this pancreatic lipase breaks down it even more it breaks down those two fatty acids that are still bound and now breaks them all down into individual lipid droplets almost usable form now remember fat is never fully dissolved it does not dissolve in water the only thing that we do is further emulsify it further and further and further until it’s small enough to be absorbed but it never fully dissolves now this pancreatic lipase does its job starts breaking down the fat even more but then it has a little helper has a helper called cola pace this Cola pace breaks down the fat even more but it helps the lipase activate and access the fat inside the droplet basically unleashing the power of the fat to yield energy on the bottom so then your gallbladder secretes something called bile this bio breaks down everything that we have here and puts it into something called a my cell and those my cells are the root of fat metabolism so now that they are in this micelle okay the gallbladder has done its job it’s broken it down even more into a really small forms into my cell well now this micelle can actually stick to the cell wall of the intestines and what happens there is nothing short of amazing this is how fat is absorbed okay so the myself sit inside the cell of our intestines and then hops on board something called a chylomicron now hear me out this is fascinating I was blown away when I started doing research on this think of a chylomicron like a train okay this chylomicron carries the fat it carries proteins and it also carries cholesterol okay and it carries an individual of everything else now mind you those fats would have been broken down into small pieces are now reformed into usable fat again into a bigger form but here’s the interesting thing these chylomicrons don’t absorb into the bloodstream they absorb into the lymphatic system into the lymph into the lymph fluid so they have their own special express lane okay so that train they got on think of it like a light rail system while everything else is sitting in traffic in the bloodstream the fats the proteins the cholesterol czar traveling with the lymph to get where they need to go pretty fascinating it’s proof right then and there how important fats are to overall metabolism right then once they get to their destination that’s when they’re Unleashed into the bloodstream and actually utilized for fuel or utilize for storage they all come back together and are in a position to let our bodies thrive on them but how much fat can you have in one sitting how much can your gallbladder handle how much can your intestinal system handle well quite frankly it’s a tough one to answer because everyone responds different you talk to some people that say they eat fats and they feel really sick or some people don’t have a gallbladder at all so they have a really hard time but let’s talk about ketosis simply because it’s hot right now and I think it has the most applicable direction for what I’m talking about see ketosis when your body’s utilizing fats for fuel instead of carbs our bodies get very efficient utilizing fats this means that the body gets better emulsifying you sort of become an emulsification machine and I’ve kind of done the liberty of breaking it down and looking at roughly how much fat you should be taking in based on calories now mind you you’re going to want to flip this up throughout the course of the day and not do it in one sitting so generally speaking you want to be doing about sixty to seventy-five percent of your calories from fat in a ketogenic diet so if you’re on a 1500 calorie diet you’re looking somewhere in the world of 87 grams of fat to maybe a hundred and eleven grams of fat if you’re on a 2,000 calorie diet you’re looking at somewhere around 111 grams of fat to 157 grams of fat then if you’re on a 2,500 calorie diet you’re looking somewhere in the spectrum of 139 grams to probably 207 grams of fat sounds like a lot of fat because it is but that’s the whole idea behind ketosis the whole idea is you want to split those up evenly but now you have an understanding of how fat is absorbed in the body it may give you a little bit more appreciation you see they’re not absorbs super fast like carbohydrates are they have a process it takes a lot of energy take a lot of calories to actually digest and burn at fat in the first place so if you have any ideas on other videos that you’d like to be coached on or things you’d like to learn make sure you comment let me know but also make sure that you hit that subscribe button do yourself a service by learning and getting coached but also it’s a huge favor for me just to see that you’re learning you can see that what I’m putting out there is actually helping you especially if you click subscribe so I’ll see you in the next video

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Fat Metabolism | How Fat is Digested and Burned: Thomas DeLauer

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Fat Metabolism | How Fat is Digested and Burned: Thomas DeLauer

Fat consumption begins in the mouth, moves into the stomach and then into the small intestine where it is absorbed

Once the fat enters the stomach, enzymes in the digestive tract called lipases begin their hard work

Fats and Lipids

Fat, also known as a lipid, is composed of three of these fatty acid chains, each bound to a single molecule called a glycerol

Emulsification and Digestion

10 percent of fat digestion takes place in the stomach using gastric lipase

Gastric lipase removes two of the three fatty acids from the glycerol by breaking the bond between them, leaving two free fatty acids and a monoglyceride

Fat does not dissolve in water, but forms emulsion droplets

Once it is in the small intestine, a substance called bile is secreted from the gall bladder to help break apart those droplets into even smaller ones – this is known as emulsification

Digestion in the Small Intestine

An enzyme in the small intestine, called pancreatic lipase, breaks down the remainder of the fat

Pancreatic lipase is assisted by a protein, called colipase, that helps the enzyme access the fat inside the droplets

The lipase then again breaks the lipid into two fatty acids and a monoglyceride

Throughout this process, the fatty acids, monoglycerides, bile, and other fats form new droplets called micelles

This enables them to move into intestinal cells, where they are prepared for absorption

Absorption into Bloodstream

Free fatty acids and the monoglycerides diffuse into the intestinal cells at the border between the intestine and the bloodstream

Once inside the intestinal cell, the fatty acids and monoglycerides are combined back into lipids again

The lipids are then enclosed in packages known as chylomicrons

**Chylomicrons – lipoprotein particles that consist of triglycerides, phospholipids, cholesterol, and proteins. They transport dietary lipids from the intestines to other locations in the body**

Chylomicrons do not pass directly into the blood. They first travel through another bodily fluid called lymph, which empties into the blood

**Lymph – a colorless fluid containing white blood cells, that bathes the tissues and drains through the lymphatic system into the bloodstream**

Once in the blood, the chylomicrons are broken apart, and the fats are ready to be used for nourishing the body

How much Fat per day on Keto

A ketogenic diet minimizes carbs, provides a moderate amount of protein and is high in fat

The percentage of calories from fat will depend on how low your carb intake is, but it will generally be between 50–75% of calories

Suggested daily, on average, fat ranges for a ketogenic diet:

Around 1,500 calories: About 83–125 grams of fat per day

Around 2,000 calories: About 111–167 grams of fat per day

Around 2,500 calories: About 139–208 grams of fat per day


Digestion and Absorption of Fats. (n.d.). Retrieved from

Fat Grams – How Much Fat Should You Eat Per Day? (n.d.). Retrieved from

How Does the Body Digest & Metabolize Fat? livestrong.com (n.d.). Retrieved from /

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