Protein is the one macronutrient your body can’t stockpile, so what matters isn’t a single daily figure but how it’s sized, spread, and balanced against everything else on the plate.
Where a day's protein lands
Illustrative. The same daily total does more when it's spread across meals than saved for dinner.
More than a total#
It’s tempting to treat protein as a single number — grams per day, hit or miss. Calk reads it on three axes instead. First, the total amount: enough in absolute terms for your body weight, which matters most when calories are lower than usual. Second, the share of your calories that protein carries — a useful lens because protein is the most satiating macro and the costliest to digest. And third, the wider protein–fat–carb balance, where large, chronic imbalances often explain why eating feels unsatisfying or energy wanders. There’s no one correct split; the ranges mainstream guidance allows are wide on purpose, because individual variation is real (Institute 2005).
With age this gets a little more pointed — the body uses dietary protein slightly less efficiently, so the target drifts upward. None of what follows is a prescription; it’s a steadier way to look at food you already eat.
Daily protein adequacy#
What Calk looks at. Calk totals the protein across everything you log and checks it against a floor scaled to your weight — in absolute grams, not a percentage. The textbook 0.8 g/kg is a floor to prevent deficiency, not a target for body composition (Rand 2003); the moment you’re training or eating in a deficit, 1.2–1.6 g/kg protects lean mass far better (Jäger 2017, Leidy 2015).
What you could try. Clear the floor most days and there’s nothing to chase — more isn’t automatically better. Fall short and the fix is small: one protein-forward anchor a day — a tin of tuna, cottage cheese, a couple of eggs. On lighter-calorie days, nudge protein up, not down.
Protein across the day#
What Calk looks at. Past the daily total, Calk watches how protein is spread. Muscle answers to a worthwhile amount at a time rather than to the grand total, so the same grams do more across three meals than poured into dinner (Mamerow 2014) — a practical aim is roughly 0.4 g/kg per meal (Schoenfeld 2018).
A back-loaded day — room to move protein earlier
Illustrative. The daily total is fine; it just all lands at night.
What you could try. The lever is almost always breakfast. Shift 20–30 g earlier — eggs, yogurt, last night’s chicken — without changing the total at all. “A palm of something protein-y at each main meal” gets you most of the way; no scale needed.
Enough protein in one sitting#
The close cousin of spreading protein out: Calk checks that your protein arrives in real portions, not as a splash of milk here and a handful of nuts there. Below a useful per-meal amount it’s still used by the body — just not for much muscle (Schoenfeld 2018). The move is simply one real protein per meal instead of topping up with fragments.
Protein as a share of energy#
What Calk looks at. Here protein is a percentage of the day’s calories, not grams — a second lens, because a day can hit its grams yet still get diluted by a flood of fat or fast carbs. Protein is the most filling macro per calorie and the costliest to digest, so a share near 15–30% sits comfortably inside guidance (Leidy 2015, Institute 2005).
What you could try. When the share reads low, it’s usually less about adding protein than trimming what surrounds it — a lighter dressing, a smaller heap of refined carbs — so the protein already on the plate carries more of it.
Protein needs with age#
What Calk looks at. If your profile sits in an older band, Calk raises the floor it measures you against: the body uses dietary protein a little less efficiently with age, so ~1.0–1.2 g/kg (more if active) holds muscle better than the general 0.8 g/kg (Bauer 2013).
What you could try. Same as any adequacy gap, one notch higher — and spread it, since older muscle responds best to a clear amount at each meal. Pair it with regular movement; protein and activity work together, and neither does much alone.
Macro balance#
What Calk looks at. Calk reads the broad split of calories across protein, fat and carbohydrate and flags only large, lasting skews — not the daily wobble. The accepted ranges are wide on purpose, because no single split suits everyone (Institute 2005).
A balanced plate, roughly
Illustrative. One comfortable middle — not a rule. Plenty of healthy days look different.
What you could try. The useful question isn’t “what’s my perfect ratio” but “is anything chronically squeezed out?” If protein or fat sits very low for weeks, ease it back toward the middle. A single lopsided day is just noise.
Niacin (vitamin B3) sources#
A light food-source note rather than a blood measurement: Calk simply sees how often niacin-rich foods — meat, fish, poultry, peanuts, whole grains — turn up. They’re common enough that ordinary variety covers it (NIH 2023); if they’re scarce, the easy additions are the same foods that help elsewhere. No supplement implied.