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PeatMonster said:Actually I remember seeing a study that suggested it had to do with serotonin. Not sure where it is right now, but the gist was that high serotonin triggered protein cravings in rats. The rationale was that most protein sources have enough of the large amino acids that compete with tryptophan, so protein tends to lower serotonin, sending a message to the brain that protein consumption was adequate. If its true that exercise causes increased serotonin because cortisol liberates a disproportionately high amount of tryptophan from tissue, then this could explain why weightlifting makes people crave meat.
StressedMom said:PeatMonster said:Actually I remember seeing a study that suggested it had to do with serotonin. Not sure where it is right now, but the gist was that high serotonin triggered protein cravings in rats. The rationale was that most protein sources have enough of the large amino acids that compete with tryptophan, so protein tends to lower serotonin, sending a message to the brain that protein consumption was adequate. If its true that exercise causes increased serotonin because cortisol liberates a disproportionately high amount of tryptophan from tissue, then this could explain why weightlifting makes people crave meat.
That is interesting PeatMonster, but does it explain the cravings I get for meat after a few days of meat-free diet (i.e., dairy and eggs being the main protein source)? I tend to think that my body is missing some of the nutrients in meat and through a mechanism signaling by cravings.
Very interesting and helpful to me too. I was struggling to understand why when I can feel I'm in the stress hormone state sugar doesn't always help. Not cheese either. Nothing seems to. I end up eating ice cream or finding a proper meal about the best.PeatMonster said:3. Bizarrely I think the actual answer (at least in my case) is glucose deficiency. Sucrose and fructose do a poor job of refilling muscle glycogen. But glucose does a good job of restoring muscle glycogen, and the body gluconeogenisis makes glucose out of amino acids. If you (like me) have been low carb for awhile, your body may have the idea that meat is a good source of amino acids to synthesize glucose. If you eat starch, I would say try eating some starch when you have a meat craving and see if it satisfies. If it doesn't this isn't the problem. If you don't do starch, you could try maltodextrin as an experiment but I wouldn't make that common practice.
sueq said:Very interesting and helpful to me too. I was struggling to understand why when I can feel I'm in the stress hormone state sugar doesn't always help. Not cheese either. Nothing seems to. I end up eating ice cream or finding a proper meal about the best.PeatMonster said:3. Bizarrely I think the actual answer (at least in my case) is glucose deficiency. Sucrose and fructose do a poor job of refilling muscle glycogen. But glucose does a good job of restoring muscle glycogen, and the body gluconeogenisis makes glucose out of amino acids. If you (like me) have been low carb for awhile, your body may have the idea that meat is a good source of amino acids to synthesize glucose. If you eat starch, I would say try eating some starch when you have a meat craving and see if it satisfies. If it doesn't this isn't the problem. If you don't do starch, you could try maltodextrin as an experiment but I wouldn't make that common practice.