Does collagen count towards daily protein for lifters?

The cereal-and-pulse rule: how incomplete proteins count for each other across a day, and why collagen counts under it as filler

Does collagen count towards daily protein for lifters is a question that the ledger pages on this site answer by keeping columns, and the honest page answers it with the nutritional rule that the columns are built on, because the rule is older than the collagen shelf, governs every mixed diet a human has eaten, and settles the question with two limits attached. The rule is protein complementation. A protein is called complete when it supplies all nine essential amino acids, the ones the body cannot make, in at least the proportions the body needs, and incomplete when it is short of one or more; most plant proteins are incomplete, cereals being short of lysine and pulses short of methionine, and if completeness were judged scoop by scoop a diet of rice and beans would fail twice. It does not fail, because incomplete proteins eaten within the same day complement each other when their limiting amino acids differ: the rice supplies the methionine the beans lack and the beans supply the lysine the rice lacks, the amino acids from both meals join the same pool over the day, and the day's total of every essential amino acid meets the requirement that neither food met alone, which is how vegetarian populations have eaten complete protein for millennia without a single complete food and why protein adequacy for people eating mixed diets is judged by the day's total of each essential amino acid rather than by the completeness of every item on the plate. The day, not the scoop, is the unit, and the old advice to combine complementary proteins within the same meal has been relaxed to the same day, since the pool holds amino acids for hours. Under that rule collagen counts, and the honest page says how. A scoop of collagen delivers its grams of glycine, proline and hydroxyproline in quantity and its small amounts of the essential amino acids, and all of them join the day's pool and add to the day's totals, while its shortages, the essentials it carries thinly, are covered by the complete proteins eaten beside it, the whey, dairy, eggs, meat, fish and pulses that make up the rest of a lifter's day, exactly as the beans cover the rice; a lifter eating 150g of protein a day of which 20g is collagen has 130g of complete protein covering the collagen's gaps and the collagen's 20g adding to the total, which is the two-column tracker on the collagen and protein intake page expressed as a rule rather than a form. So the answer to does it count is yes, as filler, under the rule that governs every other incomplete protein in a mixed diet, and the three ledgers that give three different answers on the collagen as protein page are three ways of asking how much filler a lifter's day can carry, which is where the two limits come in.

The two limits the rule does not waive, the ceiling they imply, the lifter's three-part rule, and the worked example

The complementation rule has two limits, and collagen's roster runs into both, which is why collagen is a harder case than rice. The first limit is that complementation requires something to complement: a protein that is short of an essential amino acid can be covered by one that is rich in it, but a protein that lacks an essential amino acid entirely contributes nothing to the requirement for that amino acid however much of it is eaten, and collagen contains no tryptophan at all, not a small amount but none, so that a lifter's daily tryptophan requirement has to be met wholly by the other proteins in the day and collagen's grams, whether 10 or 40, add nothing to it; tryptophan is the precursor to serotonin and niacin as well as a building block of muscle protein, and a day's supply comes from complete proteins or from nothing. The roster with its empty seats, which gives collagen a completeness score of zero because its most limiting amino acid is absent, is on the collagen protein and recovery page, and the zero is the arithmetic of this limit. The second limit is that the complementation rule works at the level of the day while one requirement a lifter has works at the level of the meal: muscle protein synthesis is switched on by leucine arriving at around 2.5 to 3g in a single sitting, and a meal that is collagen alone, with its one percent leucine, delivers a quarter of a gram and switches nothing on whatever the day's total of leucine turns out to be, so that a lifter who counts a collagen shake as a protein meal has met the day's ledger and missed the meal's threshold, and has lost a synthesis opportunity that a whey shake or a plate of eggs would have taken. The two limits imply a ceiling, and the honest page gives it as a practical one rather than a trial figure, since no trial has set it: collagen should be a modest fraction of a lifter's daily protein, a fifth or so, so that the remaining four-fifths of complete protein comfortably supply the tryptophan collagen contributes none of and the essentials it contributes thinly, and so that collagen's grams never displace a complete serving at a meal; a lifter eating 160g a day can carry 20 to 30g of collagen as filler without strain, and a lifter eating 100g who makes 40g of it collagen has a day whose essential amino acid totals are now in question. From the rule and its limits the lifter's rule follows in three parts. Count collagen towards the day's total only once the day's complete protein already covers the 1.6 to 2 grams per kilogram that the lifter's target was built from, because that target came from meta-analyses of trials that used complete protein and a collagen gram is not the gram the target was measured in; a lifter below the target in complete protein is below the target, whatever the collagen adds. Keep collagen to a modest fraction of the day's protein, the fifth or so, so that complementation has enough complete protein to work with. And never count collagen as the serving that clears the leucine threshold, since the threshold is per meal and collagen does not reach it; the collagen scoop sits beside a complete meal or before the tendon session, and the whey, eggs, meat or dairy do the switching. The worked example is a gram of filler protein by the day's ledger, stated on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% of its reference value plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, a gram and a bit of protein that joins the day's pool and counts as filler under the rule, far too small to trouble the ceiling or to be mistaken for a serving, carrying vitamin C's collagen formation sentence for cartilage and bones and no muscle claim. Does collagen count towards daily protein for lifters: under the cereal-and-pulse rule, yes, as filler above a complete-protein base, with no tryptophan contributed and no threshold cleared, and kept to a modest fraction of the day.

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