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The latest rubbish from the media [emoji849]
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<blockquote data-quote="Member496333" data-source="post: 2002048"><p>Speaking literally, nutritional ketosis is any period of time in which the body is burning fat instead of glucose. In this context though - people following ketogenic diets - it’s when the body is fully ‘fat adapted’ meaning that the <em>primary</em> metabolic pathway is ketosis as opposed to glycolysis. Obviously there should remain some flexibility in either direction. Burning glucose for fuel carries the lowest energy penalty over amino and fatty acids, and so we use it as a natural priority. From an evolutionary perspective this is to allow us to quickly and easily store energy as body fat in times of plenty (summer) so it can be used in times of hardship (winter). </p><p></p><p>To persuade the body to effectively “give up” trying to burn glucose as the primary energy source, you typically need to restrict carbohydrate ingestion to ~20-50g per day - or wait for an ancestral winter in which Sainsbury’s didn’t have boxes of glucose on the shelves 24/7/365. Personally I operate at around 10g or less (a permanent winter), or effectively net zero carbs besides non-starchy vegetables. In any case it’s a lot less than is mostly used in these studies, so the conclusions are almost always meaningless from the outset.</p></blockquote><p></p>
[QUOTE="Member496333, post: 2002048"] Speaking literally, nutritional ketosis is any period of time in which the body is burning fat instead of glucose. In this context though - people following ketogenic diets - it’s when the body is fully ‘fat adapted’ meaning that the [I]primary[/I] metabolic pathway is ketosis as opposed to glycolysis. Obviously there should remain some flexibility in either direction. Burning glucose for fuel carries the lowest energy penalty over amino and fatty acids, and so we use it as a natural priority. From an evolutionary perspective this is to allow us to quickly and easily store energy as body fat in times of plenty (summer) so it can be used in times of hardship (winter). To persuade the body to effectively “give up” trying to burn glucose as the primary energy source, you typically need to restrict carbohydrate ingestion to ~20-50g per day - or wait for an ancestral winter in which Sainsbury’s didn’t have boxes of glucose on the shelves 24/7/365. Personally I operate at around 10g or less (a permanent winter), or effectively net zero carbs besides non-starchy vegetables. In any case it’s a lot less than is mostly used in these studies, so the conclusions are almost always meaningless from the outset. [/QUOTE]
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