How much should protein be increased with a weight training program?

My brother had RNY in Sept. and has started to lift weights 3x a week(for an hour) in addition to walking 4x a week. How much should he increase his protein daily since he added the weight training? He gets about 80 grams a day now. He has been feeling weak and we thought maybe it was because he should be getting in more protein. Thanks for any input.

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