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How Long Does It Take For Ketosis To Kick In

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How To Get Into Ketosis In Less Than 3 Days

Do you need to get into ketosis super fast? Don't think you can handle the deprivation and hunger of a water fast? The good news is that you don't have to. You can rev up your metabolism, escape hunger, and be on your way to fat burning in one or two days! All it takes is a ketogenic diet that is lower in carbs than standard keto. This will cut your cravings to the bone and switch you from a glucose burning metabolism to burning fat faster than anything else! Ketogenic diets work by reducing basal insulin levels, lowering blood triglycerides, and setting up conditions that will move you into the state of nutritional ketosis. Getting into ketosis is important because when the body produces ketones, your hunger level goes down, your energy goes up, and you experience a state of well-being. All of these benefits will make it easier for you to stick to your low-carb diet plan. On a typical keto diet, it takes 3 to 5 days to enter into the state of ketosis. But how quickly you do that depends on how many carbohydrates you were eating per day before you started restricting them. In addition, if you're looking for the urine testing strips to change colors right now, that only occurs once Continue reading >>

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  1. kryptomancer

    Experienced fasters: How long does it take you to reach ketosis?

    It seems that it takes about 3 days for the average person to get into a state of ketosis when fasting.
    For those of you who are veterans of fasting, especially longer fasts (5+ days), how long does it take you to get into ketosis?
    I'm curious about this due to this guy going into ketosis in only 2 days on his second 5 day fast. Was wondering if it was due to the avocado or his body just adapting faster.

  2. Glarsie

    You should be in ketosis once your liver glycogen stores are depleted. In a fast this should occur in 24-48hrs after your last meal and will be influenced by your insulin sensitivity (which affects you basal insulin level) and the amount of glycogen in your liver (ie what you ate leading up to the fast). It's entirely possible (some would argue desirable) to be in ketosis before fasting. Nutritional ketosis generally starts when you have a betahydroxybuterate level greater than .5 mmol/L which can't be accurately measured through urine ketostix which only show excreted acetoacetate (not blood concentrations of BHB). You can turn those keto sticks dark purple just by restricting fluid intake and becoming slightly dehydrated or equally make them not register by drinking half a gallon of water.
    Ketosis is brought on by a lack of carbohydrates/insulin and not by the presence of fat.
    Eat under 20g of net carbs per day (don't count fibre) for 3 days and you will be in ketosis. You will probably be in ketosis sooner, but 3 days is pretty true for everyone.
    Remember that as you produce ketones you will start to use them as well as free fatty acids for fuel (less is excreted in urine and blood levels don't increase indefinitely). In the end ketones will be used primarily for your brain and other tissues not able to use FFA while glucose will be reserved for cells that can only use glucose (eg red blood cells and some parts of the brain). The breakdown of triglycerides into FFAs also releases glycerol that is converted into glucose to supply the now reduced demand for glucose. This doesn't happen as soon as you produce ketones but over a few days as your levels increase.
    Edit: nutritional ketosis defined as starting at .5 rather than .3 mmol/l

  3. kryptomancer

    this should occur in 24-48hrs after your last meal
    Actually in the link I posted it took 3 days initially for the guy to go into ketosis, then on the second time through it only took him 2. I'm very interested in to why this was as I am planning on doing a series of longer fasts and want to make it as easy as possible.
    and will be influenced by your insulin sensitivity
    So perhaps the reason why the 2nd fast was quicker to get into ketosis with due to increased insulin sensitivity from his initial fast?
    and the amount of glycogen in your liver (ie what you ate leading up to the fast).
    This is my current plan: eat under 20g carbs for two days, start water fasting on the third and lifting heavy squats and dead lifts; then taking apple cider vinegar before bed.

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