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When Will Ketosis Start

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How Long Does It Take To Get Into Ketosis?

[Some of the links in this post are affiliate links. If you choose to purchase something after using one of those links, I might receive a small financial compensation at no cost to you.] The main benefit of going into ketosis is the reduced hunger that results when you start burning fatty acids for fuel, so many dieters aim to get into that state quickly. Getting into ketosis is a simple process and occurs faster than most people think. What takes longer is adapting to using fatty acids for fuel. It will also take a few days before you start spilling unused ketone fragments into your urine. That kick-start of energy also doesn't happen until ketosis is well underway, as you'll need to be burning fats before you start to feel better. If you're looking for a great way to kick-start the new year off right, a Keto diet can help you change your life for the better. With the help of the state of ketosis, the most effective way to shed those unwanted pounds, you'll be able to lose weight without feeling hungry or deprived. In no time at all, you'll be in the wonderful state of ketosis and singing its fat-burning praises. But, when can you expect that to happen? How long does it take to g 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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