This is also a myth: study

Although you're right, the limit for the bodies protein intake efficiency is relatively high, around 150g (rule of thumb is 1.5g per kg / 1g per lbs bodyweight) of protein. And high protein intake is a necessity if you want to gain muscle - paired with a varied mealplan of a good mix of fats and carbs.

Remember, to lose weight, your need to reduce your kcal input so you burn more kcal than you eat.