How Long Does It Take To Get Your Body Into Ketosis?

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How To Use (and Not To Use) Exogenous Ketones For Weight Loss

“How do I use ketones to help me lose weight?” Great question. It’s worth the few minutes to understand how exogenous ketones can help people lose weight on a ketogenic diet, and not just jump to the conclusion that ketones = weight loss. Breaking Down Ketone Weight Loss Misconceptions The most common misconception (perhaps due to excessive marketing claims) is that taking ketone supplements will induce immediate weight loss. The purpose of this article is to explain how to use ketones as a piece of the puzzle in your weight loss lifestyle. Remember exogenous ketones are supplements. Very effective at what they do, but none the less, should be supplementary to a low carb/ketogenic style of eating that is geared towards weight loss (if weight loss is the goal). Ketones don’t cause weight loss, they help cause ketosis. Ketosis is a metabolic state where your body is using fatty acids for its primary source of energy. Just because you are using fat does not necessarily mean you are going to be losing weight or have a decrease in body fat percentage over an extended period of time. I have been in deep nutritional ketosis (>3.0mmol/dL) and had an increase in body fat percentage. Continue reading >>

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Popular Questions

  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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