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The study says that under 65 a protein-rich diet will basically kill you, while over 65 it's actually beneficial ?

Is explained in any way why it should be so ?

And I assume that this study is serious and other factors are accounted for, since it's likely that people with a lower animal protein intake have a more balanced diet overall, with an higher intake of fruits and vegetables and a lower intake of saturated fats...

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It says that early on and for extended periods these things cause heart disease and cancer, which would be bad for somebody over the course of 65 years, and the amount of protein is unnecessary. But when you get older and your body starts to break down, the increased protein is better for you.

And, although it doesn't say it, by the time you're 65 and if you have been eating healthy all of that time, developing cancer from a proten-rich diet is mitigated by the fact that you only maintain that diet for your remaining 15-25 years, not for the 65 leading up to then.

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