Enough protein, at every meal

For decades the official advice on protein was a minimum: enough to prevent deficiency, about point-eight grams per kilogram of body weight. A group of researchers spent the 2000s showing that the minimum was the wrong number for anyone who wanted to keep their muscle through a life.

Donald Layman at Illinois showed that protein at each meal, not just the daily total, matters, because the body builds muscle in response to a threshold of amino acids arriving at once. Stuart Phillips at McMaster showed in trial after trial that older adults need more protein than younger ones to get the same building response, and that the lifting key from the second month works far better when the protein is there to build with. And Gabrielle Lyon, in Forever Strong in 2022, put the findings into a program: muscle as the organ of longevity, protein as its raw material.

The numbers that have emerged. About 1.2 to 1.6 grams per kilogram of body weight per day for active adults, roughly double the old minimum. Spread across meals, 25 to 40 grams each, because one big protein dinner doesn't do what three moderate protein meals do. And more, not less, as you age, because the body gets less efficient at using it.

What this means at the table is simple and, for most people, a real change. Protein first, at breakfast, which is the meal most of us skip it at. Eggs, Greek yogurt, fish, beans, tofu, meat, in a portion the size of your palm, at every meal.

It's a Meaning-chamber key because it completes the muscle keys from months ago. Muscle is medicine; the lifting sends the signal; protein is what the body builds with. A hundred and thirty-six days of walking and lifting need this to show up on the frame.