Protein intake...So much different advise....

The Recommended Dietary Allowance (RDA) for protein is a modest 0.8 grams of protein per kilogram of body weight. The RDA is the amount of a nutrient you need to meet your basic nutritional requirements. In a sense, it’s the minimum amount you need to keep from getting sick — not the specific amount you are supposed to eat every day.

For a relatively active adult, eating enough protein to meet the RDA would supply as little as 10% of his or her total daily calories. In comparison, the average American consumes around 16% of his or her daily calories in the form of protein, from both plant and animal sources.

The Protein Summit reports in AJCN argue that 16% is anything but excessive. In fact, the reports suggest that Americans may eat too little protein, not too much. The potential benefits of higher protein intake, these researchers argue, include preserving muscle strength despite aging and maintaining a lean, fat-burning physique. Some studies described in the summit reports suggest that protein is more effective if you space it out over the day’s meals and snacks, rather than loading up at dinner like many Americans do.

Based on the totality of the research presented at the summit, Rodriguez estimates that taking in up to twice the RDA of protein “is a safe and good range to aim for.” This equates roughly to 15% to 25% of total daily calories, although it could be above or below this range depending on your age, sex, and activity level. That range fits nicely into the recommendation from the current Dietary Guidelines for Americans that we get 10% to 35% of daily calories from protein.

The picture below summarizes the literature. As you can see, 1.8g/kg (0.82g/lb) is the point at which additional protein intake ceases to yield any benefits.

But I train harder!
If you still think you need more than 0.82g/lb because you think you train harder than these test subjects, think again. Lemon et al. (1992) studied bodybuilders training 1.5 hours per day, 6 days per week and still concluded 0.75g/lb is the highest intake at which body composition benefits could occur.

But what about when cutting?
A final objection that is often heard is that these values may be true during bulking or maintenance periods, but cutting requires more protein to maintain muscle mass. Walberg et al. (1988) studied cutting weightlifters and they still found 0.73g/lb was sufficient to maintain lean body mass.



A perhaps even more telling study is by Pikosky et al. in 2008. The researchers took a group of endurance trained subjects and had them consume either 0.41 or 0.82 g/lb of protein per day. They also added a thousand calories worth of training on top of their regular exercise. So these guys were literally running on a 1000 calorie deficit while drastically increasing their training volume. Talk about a catabolic state… Of course the nitrogen balance in the low protein group plummeted. However, the protein intake of 0.82 g/lb in the other group completely protected the subjects from muscle loss. Nitrogen balance, whole-body protein turnover and protein synthesis remained unchanged.