Luckily I found Protein Power in 1999, which set my protein target at 82g/day, so I have been prioritizing protein ever since. It made a big difference compared to the RDA of 46g I had been aiming for when on low-cal diets before that ... and always felt hangry & tired and had lived with hair and nails that split easily for nearly 30 yrs. Following Marty's DDF, my minimum is 72g but I stay over 82 and aim for 100g. And 80% of that needs to be animal protein or I feel weak and tired.