High protein diets is a bunch of bullshit invented by supplement companies to sell more protein powder.
Hardly!! The old-school bodybuilder swore by high-protein diets. Most of them just either ate a lot of meat (Serge Nubret claimed to eat 8 lb. of beef a way, during a time where (he claimed) beef cost a fortune in France).
There were tales of guys, downing a gallon of milk a day (130 grams of protein, BTW), or carrying bags of boiled eggs so they could eat some every couple hours.
Old-school protein shakes were mainly just milk and eggs, blended together (which would tear you up if you're lactose-intolerant).
But claiming that high-proteins diets are BS, just to sell protein power, is well.......BS!!
Protein powders help, because they're portable, easy to consume (especially at work or school), and can help you ingest more protein than you can normally chew and swallow.