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Question: For how long does methionine from a meal support methylation?
What I can say much more easily is that methionine is going to effectively run out as the fasting state emerges. Methionine has many fates, right? And so if it all goes into the methylation pool, it's going to be quickly either used for methylation or broken down in the CBS pathway. You are not going to save methionine for the fasting state.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.