In 1983, researchers first found that eating extra protein
increases your “glomerular filtration rate,” or GFR. GFR is the amount of blood
your kidneys are filtering per minute. It was this result that led some
scientists to deduce that a higher GFR places your kidneys under greater
stress.
Nearly 20 years ago, Dutch researchers found that while a
protein-rich meal did boost GFR, it didn’t have a negative effect on overall
kidney function. In fact, there’s zero published research showing that
consuming large amounts of protein- up to 1.27 grams per pound of body weight a
day- damages healthy kidneys.
As a rule for your average exerciser you should be looking
at getting 15 per cent of your calories a day from protein. So if you eat 2000
calories a day 300 should come from a protein source. You should aim for a gramme
of protein for each two pounds of bodyweight.
For someone looking to gain muscle you should aim to eat
your target body weight in grammes of protein daily. For example, if you’re a
fat 200 pounds and want to be a lean 180, then have 180 grams of protein a day.
Likewise if you’re a skinny 150 pounds but want to be a muscular 180.