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How Long Does It Take For The Body To Go Into Ketosis?

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How Long Does It Take For The Ketosis Diet To Work?

When it comes to weight loss, everyone wants rapid results. A ketosis diet, better known as a ketogenic diet or low-carb diet, helps you lose weight by forcing your body to burn fat for energy instead of carbs, causing you to go into a state of ketosis. The rate of weight loss on a ketosis diet varies, and how long it takes to work depends on how much weight you need to lose, but you may be able to lose more than 12 pounds in a month. Video of the Day Your body's preferred source of fuel is glucose, which is derived from carbohydrates. When fasting, your body undergoes hormonal changes that stimulate the release of fat from your fat cells, where it is transported to the liver and made into ketones, which are then used for energy. The ketogenic diet is high in fat and protein and low in carbohydrates, which mimics fasting to produce ketones and the state of ketosis. How quickly you get into ketosis varies, but can happen in one to two days. When followed as advised, people on a ketogenic diet for weight loss lose weight and lose it quickly, according to dietitian Juliette Kellow. According to a 2008 study published in the "American Journal of Clinical Nutrition," men who followed a 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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