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alright let’s talk about fasting but not the kind of fasting that I’m normally talking about I want to talk about juice fasting I want to really explain the science and truly get down to brass tacks as to why fructose is totally different and why juice fasting is not the way to go I have to make sure that I give you the science on it because there are way too many people out there that are saying that juice fasting is the way to go and that juicing your fruits and veggies is 100% the best way to get your nutrients totally calling nonsense on that right out the gate so I’m gonna talk about some stuff first thing I want to talk about is the fact that when you were on any kind of juice fast the calories are just flat-out way too low and some of you might be watching this saying okay Thomas is always talking about fasting how can calories be too low well it comes down to this ok when you’re fasting you’re looking at a hormonal situation okay you’re not eating food at all so you’re getting a hormonal response when you’re juice fasting you’re not really fasting you’re juicing and you’re just consuming too low of calories I would rather you consume zero calories then go through the day consuming like 600 calories and trying to get by especially when you take into consideration some of the other things I’m going to talk about so a big difference there so the next thing I want to talk about is the protein situation now when I’m talking about protein you know that I’m generally not the biggest fan of consuming tons of protein it’s just not my thing but there is a fine line that we need to look at too little protein is going to make it so you’re never satiated okay you’re gonna end up not having that grail and inhibition response now what that ultimately means is when you consume just a little bit of protein or just enough protein your body is not going to be producing copious amounts of Greatland which means you’re gonna be satiated juice fasting makes you hungry all the time for a multitude of reasons there was actually a study the American Journal of Clinical Nutrition that took a look at protein consumption okay what they found was really interesting they found that when you went from consuming 15 percent of your daily calories from protein up to 30 percent that those people generally consumed 447 less calories throughout the course of the day 447 okay if you were to do that for a week you would lose more than a pound you would lose I mean it’s crazy just if I simply increase in the protein amount but not changing your calories 30% of your calories from protein is perfectly acceptable in my book that’s still low protein compared to what most of the fitness community and the health community really touts that’s still low protein by many standards and perfectly cool for a ketogenic diet as well so I definitely wanted to make sure that you knew that all right now we need to talk about something else we’re talking about fiber we’re talking about the good stuff okay the stuff that’s on the skin of these apples and these pears the stuff that we truly want okay now fiber is great okay it’s great because it gets you moving it gets you the bathroom situation rolling but that’s not even what I’m talking about what I actually want to talk about is the antioxidant effect of the fiber so what we don’t always realize is that most the antioxidants in these fruits ok these fruits that we’re always touting the awesome benefits of they’re tied into the fiber the antioxidants are tied into that fiber so what happens when you juice it you get fructose you get sugar you get sugar and you get some colored water that has a little bit of antioxidant activity whereas most of those antioxidants are bound in the fiber I truly don’t care about the fiber as far as the bathroom situation goes that’s a topic for another day what I care about is the fiber and the antioxidants that are bound to it okay now I get to talk about the one that I’ve been proud to talk about and that I get a lot of haters about this is the world of fructose metabolism so put on your seat belt because I’m about to take you down a bumpy road of learning exactly what fructose is doing in your body that no one else really wants you to know all right here it goes fructose is metabolized super differently than anything else in the body glucose can be used by every single cell in our body fructose can only be used by liver cells so what does that mean that means a hundred percent of the metabolic burden whenever you are actually having fructose is falling on the liver okay you have this banana it’s all having to tax the liver the other cells aren’t using it the liver is using it now glucose on the other hand not saying you should go out and eat a ton of glucose but glucose ends up having 20% of the metabolic load land on the liver 80% lands on the rest of the body the other cells so do you put all that energy to your liver well here’s the other problem the liver can only handle so much at a given time glucose is also used super super quickly but the important thing that you need to know since fructose is not used as quickly it gets turned into free fatty acids and triglycerides extremely the liver takes the fructose and what it doesn’t use it turns into free fatty acids those free fatty acids turn into triglycerides and store in the liver leading to a fatty liver but it doesn’t just lead to a fatty liver it doesn’t just lead to a metabolic disorder that we don’t really even think about know it can lead to fat accumulation directly in the belly that’s exactly the issue are always complaining about because the first place is gonna go is store in the liver and directly around the liver right where we don’t want it now here’s the other thing fructose it loves fat the heck is that supposed to mean it means whenever you’re consuming these pears whenever you’re consuming this Apple or anything like that it’s seeking out fats why because it turns into something known as activated glycerol activated glycerol is what is known as something that is a lipophilic another word for loving fats lipo fat philic attracted to basically that activated glycerol takes free fatty acids turns them into triglycerides and causes your body to store them so if you’re already eating a higher fat diet and then you’re consuming copious amounts of fruit yeah you can run into a serious serious problem but as pertaining to fruit fasts you’re just loading up with fructose that your body can’t handle now there’s some science to even back this one up this is a more recent study that was conducted at the University of Urbana Champaign and I actually just totally got my rocks off on watching this one because what this one looked at was the metabolic difference when it came down to metabolizing glucose and versus fructose so they took mice okay and with these mice they split them into two groups with these two groups they gave 18% of their calories from either fructose or 18 percent of their total calories from glucose so what we were trying to look at was what was the difference when the calories were the same well the mice that were fed 18 percent of their diet from fructose ended up having significantly more weight gain and were significantly more sedentary calories were the same only difference was fructose versus glucose do the math now one last thing before I let you go and this is the big one and I’m going to break it down to an analogy that makes a lot of sense fructose requires a unique delivery system called an active transport chain it utilizes what’s known as the glute two in the glute five transport system here’s a little bit of how it works if this is a bus and this is another bus what’s going to happen is you consume the fruit it’s going to tack on to what’s called the glute 5 transport system which is a small bus it can only hold a little teeny bit this bus is gonna drive on down the road to the intestinal tract okay and then it’s gonna stop at what’s called the entero site okay an intestinal cell then it’s gonna pick up a ride on the glute to transport system which is a slightly bigger bus this glute to transport system derives it directly to the liver let me explain the situation fructose has to ride on a small confined bus which means we can only hold so much at a given time in fact most people can only hold between 5 and 50 grams of fructose at any given point in time the rest gets stored as fat but to add insult to injury it has to stop at a bus stop it has to take two different stops it goes blue five stops in the intestinal cell and then hops on glueck too so what happens to the remainder the remainder floats around turns into activated glycerol turns into free fatty acids gets stored as triglycerides and ultimately makes us fat so juice fasting ends up riding a funky little bus that doesn’t get anywhere directly whereas glucose is going to Taba lies a lot faster now I’ve talked enough about fasting I’ve talked enough about fruit fasting and I’ve talked enough about scaring you out of fruits the thing is don’t be afraid of fruits they’re not a bad thing but you have to use them in moderation and don’t give me the nonsense that someone that has been consuming fruit all their life is skinny I would like to see a cross-section of their liver because I can almost guarantee it they’re gonna have a non-alcoholic fatty liver disease that causes a very big problem so as always make sure you keep it locked in here on my channel and if you have any ideas for further videos make sure you post them in the comments section below I’m sorry if I rain on your parade by telling you that you need to chill and juice fasting but I just want to give you the science so I’ll see you in the next video
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Juice Cleanses Debunked! Why You Should Avoid Them- Thomas DeLauer…
Most juice cleanses last from anywhere between 3 and 14 days and are usually within the caloric range of 600-1200 calories, which is low for almost everyone. The continued low-calorie intake can send the body into starvation mode (prolonged periods of low energy intake) and the body will try to conserve calories by slowing down metabolism – most weight lost is usually just water weight.
Juice cleanses are also very low in protein and it is not just needed to build muscle – needed to build healthy immune cells and is used to make enzymes and hormones. Protein can also be quite satiating, by reducing levels of ghrelin – a study from the American Journal of Clinical Nutrition found that increasing protein consumption from 15 to 30% of calories made subjects eat 441 fewer calories each day, without intentionally restricting foods (1)
Fiber is lost during the juicing process – Some soluble fiber will remain, but the majority of insoluble fiber is removed. We need the fiber content of the fruit or vegetable to experience the plant’s full health benefits as antioxidants that are naturally bound to plant fibers are lost in the juicing process (4)
Should be known that while every cell in the body, including the brain, can use glucose, fructose is metabolized differently – the liver is the only organ that can metabolize fructose. Whereas with glucose, your liver has to break down only 20% of it (we weren’t designed to consume much fructose, if at all) Since every cell in your body can utilize glucose, it is used up fairly quickly after consumption. Conversely, when fructose is metabolized, it turns into free fatty acids (FFAs) and triglycerides, which get stored as fat. These fatty acids accumulate as fat droplets in your liver and skeletal muscle tissues, causing insulin resistance and non-alcoholic fatty liver disease (NAFLD) Additionally, fructose converts to activated glycerol (g-3-p), which is used to turn FFAs into triglycerides – The more g-3-p you have, the more fat you store (fructose is a lipophilic carb) A byproduct of liver metabolism is that your liver begins to create uric acid, causing blood pressure to increase and can result in gout. Fructose has no effect on ghrelin (glucose, for example, can suppress ghrelin → suppresses appetite) and interferes with your brain’s communication with leptin, resulting in overeating (2,5)
A study conducted at the University of Illinois at Urbana-Champaign fed mice a diet in which 18% of the calories came from fructose vs mice whose diet included 18% glucose. The mice who ate fructose gained more weight, were less active, and had more body and liver fat after 10 weeks. All the mice in the study ate the same number of calories, the only difference was the type of sugar they consumed (3)
1) A high-protein diet induces sustained reductions in appetite, ad libitum caloric intake, and body weight despite compensatory changes in diurnal plasma leptin and ghrelin concentrations. (n.d.). Retrieved from
2) Sugar May Be Bad, But Fructose is Far More Deadly, Part 1 of 2. (n.d.). Retrieved from
3) Fructose decreases physical activity and increases body fat without affecting hippocampal neurogenesis and learning relative to an isocaloric glucose diet. Retrieved from
4) Juicing: Good or Bad? (n.d.). Retrieved from
5) Fructose and Fatty Liver – Why Sugar is a Toxin – Diet Doctor. (n.d.). Retrieved from
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