When should I take protein shakes on rest days?

[thirddan]

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just strive to get at least 1gram/lb or more a day and youll be fine.

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Just to clarify, I think it should be 1gram/lb of lean mass, not total mass.

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it depends, for leaner (not obese or super fatties) its usually total pounds...for obese and really fat its usually lean pounds...