Pardon my math. It's 50 grams protein=200cal (4 cal per gram). So 200cal/2500cal total which is up to 8% of total calories from protein.With Roddy it sounded like he decided a 50:1 total calorie to protein calorie ratio is better for health and he's only excluding growing children from that formula. Technically it isn't "general" bc he excludes children but it's pretty close.
Natives from New Guinea lived on sweet potatoes for generations and I believe they were eating around 5% protein. Dr. Peat mentioned them a few times. They adapted fine.
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