Did you know that the majority of healthy adults need just 0.75g protein per kilo body weight? Yep - a 75 kg male needs about 56g protein day. A typical protein shake has 20-25g per serve. That's a whole lot of extra protein filtering for the kidneys on top of usual dietary protein take.
Protein shakes and bars have a place for athletes post recovery, but they are not better than food and shouldn't be used as meal replacements.
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