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Nutritious Foundations
Protein is an important macromolecule that helps your body build and repair tissue, carry oxygen in your blood, makes antibodies, and a hundred other essential processes. That's why protein is referred to as the building block of the body.
In popular media, protein is all the rage these days. From protein shakes to protein bars to plant sources of protein, protein products are everywhere! The media is telling us to eat more protein to build muscle, eat more protein if you want to lose weight, eat more protein just because. But how much protein do we really need? And where should I get it from? Meat? Beans? Protein Bars? Protein shakes? It's time to clear up the confusion.
A quick perusal of the internet shows protein recommendations all over the map, anywhere from .8 g protein/kg all the way up to 2 g protein/lb. That's a huge range there and the math gets tricky because recommendations can be found in both kilograms and pounds. Since official maco recommendations are always given in grams, let's simplify things and deal only in the metric system.
The RDA for protein is 0.8 g protein/kg body weight. While this is the official recommendation, there is quite a bit of debate surrounding this number. Some people say it is too little while others say it's too much. And still others point out that individual needs and goals should dictate the amount of protein a body needs. Still 0.8 g can at least provide a starting place.
Following are some very general guidelines:
RDA: 0.8 g protein/kg body weight
Weight Loss: 1.0 -1.2 g protein/kg body weight
Older Adults (to prevent loss of LBM) 1.0-1.2 g protein/kg body weight
Athletes (or those looking to build LBM): 1.2-1.6 g protein/kg body weight
Hypermetabolic (as in some extreme disease states): 1.5-2.0 g protein/kg body weight
Compromised kidney function or chronic kidney disease (stage 3+): .6-.8 g protein/kg body weight
2 g protein/kg body weight is considered an upper limit intake of protein and interestingly, there are risks to consuming a high protein diet. Studies show that people who consume a lot of protein are at a higher risk for kidney stones. A
study completed this year found that consuming too much protein has adverse health effects even though consumers are led to believe they cannot get too much protein in their diets. Specifically, the researchers found that consuming protein in excess of 22% of total calorie intake carries more risk than dietary benefit due to a signaling mechanism for a specific amino acid that can trigger cardiovascular disease. Of course, this was just one study, but it does show another side of the protein picture. Maybe more isn't always better?
Another important consideration is: Where is the protein coming from? Red meat and bacon? Or beans and yogurt? The former increases your risk of heart disease and colon cancer (among others) while the latter may not. In fact, high consumption of beans and yogurt could actually lower risk cardiovascular disease and colon cancer due to high amounts of fiber in the beans and probiotics in the yogurt.
Although protein is such an important part of the diet, if you are eating excessive amounts of protein, especially sourced from manufactured products such as bars and powders, you have less room for whole foods such as fruits, veggies, and whole grains. So remember to balance your intake of protein with healthy carbs and fats.
Exercise is the best medicine
--Hippocrates
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