Comment by dmayle

Fun...

This is something I have been thinking about and researching for awhile, because there is so very much confusing language out there.

Your quote says over the last century, so I'm going to use roughly 1920 as the baseline. It also refers to a per capita increase of meat consumption by 100 pounds, or about 45.4 kilograms (to make the math easier). This is roughly an increase of 124g of meat per person per day (or about 3oz if that makes more sense to you).

This equates to a daily increase in per-capita protein intake by 25-30g (depending on which meat and how lean it is).

In 1920, the average American adult male was about 140 pounds, and ate about 100g of protein per day, which works out to roughly 0.71 grams per pound of body weight (or about 1.6 grams per kilogram).

In 2025, one century later, the average American adult male is 200 pounds, and if he eats the same ratio of weight to protein, you would expect that he would eat around 140g of protein per day, which is slightly higher than the increase in per-capita meat consumption over the same time.

However, if you look at actual statistics of what people are eating in protein, you'll see that the average American adult male is actually eating about 97g of protein per day, or about 0.49 grams per pound (1.1 grams per kg), which is much less than we ate a century ago, which means that that the increase in meat consumption doesn't match change in protein, so is offset by either less non-meat protein, meat with lower protein content (e.g. more fat), or both.

There was some discussion lower in the thread about bodybuilders vs normal people, and about basing your calculations on lean body weight vs full bodyweight. Lean body weight calculations are often used for bodybuilders, but those numbers are elevated (typically 1 gram of protein per pound of lean body weight). For someone who is sedentary to lightly active (e.g. daily walks), the calculation is based on full body weight, not lean body weight, and is about 0.7 gram per pound (or 1.5 grams per kilogram), which matches this recommendation exactly.

Hitting these targets has been shown to greatly increase satiation, reduce appetite, but it does not make you lose weight, and it is not permanent (reducing your protein intake removes the effect, which makes sense). However, long term studies show that people who increase their protein intake to these levels and lose weight (through calorie reduction or fasting) keep that weight off.

Finally, from what I've been able to cobble together, high protein intakes combined with high fat and high sugar intakes does not have the same effect as a diet that matches the recommendations here (ie. it's not just about higher protein intake, it's about percentage of calories from protein, which should be around 20-25%... 200 pound sedentary to lightly active adult male, 140g of protein, or 560 calories, in a total diet of 2250-2800 calories, depending on activity level)