The Question a Triangle Test Can Actually Answer
“Does MSG make steak taste better?” is not a testable question in a home kitchen. “Can a taster reliably pick the odd sample at a given dose on a seared crust?” is. The difference matters, because the first question smuggles in a preference claim that no triangle test can resolve, and the second is a discrimination claim that a triangle test is designed to address.
A triangle test presents three samples: two identical, one odd. The taster must identify the odd sample. Chance performance is 1/3, as the sensory literature states plainly: “in the case of a triangle test, there is a 1/3 probability that the participant will select the odd (correct) sample by chance” (Hartley et al., Chemical Senses, 2022). That is the entire instrument. It measures whether a difference is detectable under the conditions of the test. It says nothing about whether the detected difference is pleasant, desirable, or an improvement.
This piece explains what the published triangle-test literature supports, what it does not, and how to run a home adaptation with honest reporting of what the result can and cannot mean.
What the Umami Literature Actually Compares
The standard comparison in umami discrimination research is not MSG on a steak. It is isomolar 29 mM MSG versus 29 mM sodium chloride in solution. The Hartley et al. paper describes the method directly: “To determine individuals’ umami discrimination status, many studies use a series of triangle tests containing isomolar (29 mM) sodium chloride (NaCl) and MSG, requiring participants to correctly identify the odd sample.”
That design isolates the glutamate ion from the sodium ion. Both solutions carry sodium at the same concentration, so a taster who can distinguish them is responding to the glutamate, not to saltiness. The finding that matters for anyone thinking about MSG on food is that a substantial subgroup cannot make this discrimination. As the same paper reports, “A proportion of the population has a reduced or complete inability to taste l-glutamate independent to the sodium ion.”
This is the factual spine. MSG is the sodium salt of glutamic acid (FDA, “Questions and Answers on Monosodium Glutamate”), and the prototypical umami stimulus in sensory research is MSG (Hartley et al., 2022). But the discrimination literature is built on aqueous solutions, not on seared beef crust.
The Repetition-Count Problem
A single triangle test is a weak instrument. The Hartley et al. study makes this explicit: “This indicates that the number of repetitions conducted dictates the proportion of discriminators and nondiscriminators classified from the study population.”
The arithmetic is straightforward. With 24 triangle tests, a taster needs at least 13 correct identifications to exceed chance at P < 0.05. With 12 tests, the threshold is at least 8 correct. The same paper reports that “Twenty-four triangle tests produced the most consistent categorization of tasters across sessions (68.4%),” and that test-retest correlation was highest for n = 24 (ICC = 0.50) compared with n = 12 (ICC = 0.37).
Individual variation across sessions is not a rounding error. In one study cited by Hartley et al., “26% of women who discriminated on day one, did not discriminate on day 2, and 30% of women who did not discriminate MSG from NaCl on day one, did on day 2.” A single session’s result is a data point, not a classification.
What the FDA Position Does and Does Not Provide
The FDA considers the addition of MSG to foods to be “generally recognized as safe” (GRAS). The agency also notes that in studies with self-identified MSG-sensitive individuals given MSG or a placebo, “scientists have not been able to consistently trigger reactions.”
The FDA cites a FASEB report that “identified some short-term, transient, and generally mild symptoms, such as headache, numbness, flushing, tingling, palpitations, and drowsiness that may occur in some sensitive individuals who consume 3 grams or more of MSG without food.” The same source states that “a typical serving of a food with added MSG contains less than 0.5 grams of MSG.”
That 3-gram figure is a safety-context number, not a culinary dose. Using it as a target for a steak would be a category error. The FDA source does not recommend a dose for cooking, and no retrieved source supports any specific gram dose of MSG as correct or optimal on a seared strip steak.
What No Retrieved Source Supports
No retrieved source tests MSG on seared steak. No retrieved source measures free glutamate content in a seared beef crust. No retrieved source establishes a culinary dose of MSG for steak. No retrieved source supports the claim that MSG improves the flavor, crust, browning, or perceived savoriness of seared strip steak.
The crust introduces variables the solution-based literature does not model: fat, Maillard reaction products, salt, texture variation, and the thermal history of the sear. A home result should be reported as a result about that steak on that day, not as a general claim about glutamate detectability.
A Home Protocol for a Seared Strip Steak Triangle Test
The following is an adaptation of the laboratory method, not a validated consumer protocol. It controls the variables the literature controls: identical samples by mass, identical sear and rest, identical internal temperature, coded presentation, forced choice, and a pre-declared number of trials before tasting.
Materials and Measurements
- Three strip steaks of equal mass, weighed to the nearest gram on a kitchen scale. Record the mass of each.
- A calibrated instant-read thermometer. Record the internal temperature of each steak at the end of the rest.
- A timer. Record sear time per side in minutes and seconds.
- Monosodium glutamate, food grade. Record the mass used per spiked sample to the nearest 0.1 g.
- Three identical plates, coded A, B, C by someone who is not the taster.
Procedure
- Bring all three steaks to the same starting internal temperature. Record it.
- Sear all three under identical conditions: same pan, same surface temperature if measurable, same time per side, same rest time. Record pan temperature if you have an infrared thermometer, sear time per side, and rest time.
- After the rest, weigh each steak again. Record the mass loss.
- Apply MSG to one steak only. The dose is your choice, but record it in grams. Apply it to the crust surface, not the cut face.
- Have the coder plate the samples: two unspiked, one spiked, in random order. The taster must not know which is which.
- Present all three to the taster at the same time. The taster tastes each and states which is the odd sample. Forced choice: no “I can’t tell” option.
- Record the response and the dose.
- Repeat across separate sessions. Pre-declare the number of sessions before the first tasting. Twelve sessions is the minimum for a 12-test threshold; 24 is the number the literature identifies as most consistent.
What to Record
For each session: steak mass before and after sear, internal temperature at rest, sear time per side, rest time, MSG dose in grams, and whether the taster identified the odd sample correctly. After the pre-declared number of sessions, count correct identifications. Compare to the binomial threshold: at least 8 of 12, or at least 13 of 24, to exceed chance at P < 0.05.
A Hypothetical Worked Example
This is an illustration of how to read results, not a report of an actual test.
Suppose a taster runs 12 sessions at a dose of 0.5 g MSG per spiked steak. The taster correctly identifies the odd sample in 7 of 12 sessions. The binomial threshold for 12 tests is 8 correct. The result does not exceed chance at P < 0.05. The honest conclusion is: under these conditions, at this dose, on this steak, this taster did not reliably discriminate the spiked sample from the unspiked sample.
Now suppose the same taster runs 12 sessions at 2.0 g per spiked steak and correctly identifies 10 of 12. That exceeds the threshold. The honest conclusion is: under these conditions, at this dose, on this steak, this taster reliably discriminated the spiked sample. It does not mean the spiked steak was better. It does not mean the taster would discriminate at a lower dose. It does not mean the result generalizes to other tasters, other steaks, or other sear methods.
If the taster runs 24 sessions at 0.5 g and correctly identifies 14 of 24, that exceeds the 13-of-24 threshold. The result is stronger because the repetition count is higher, but the same limits apply: it is a discrimination result, not a preference result, and it is specific to the conditions recorded.
What You Can and Cannot Conclude
You can conclude that under the conditions you recorded, at the dose you used, on the steak you cooked, a taster did or did not discriminate the spiked sample above chance. You can report the dose, the mass, the temperature, the time, and the count.
You cannot conclude that MSG improves steak. You cannot conclude that any dose is correct or optimal. You cannot conclude that your result generalizes to other tasters or other steaks. You cannot conclude that a single session’s result classifies you as a “taster” or “non-taster” in the sense the literature uses, because the literature’s classification depends on repetition count and shows substantial variation across sessions.
The triangle test is a discrimination instrument. It answers a narrow question well. It answers the broader question — whether MSG belongs on a seared strip steak — not at all.
FAQ
Can I run a triangle test with just one session?
You can, but the result is a single data point. The literature shows that discrimination status varies across sessions, and that the proportion of “discriminators” depends on the number of trials. A single session cannot classify a taster reliably.
What dose should I use?
No retrieved source establishes a culinary dose for MSG on steak. The FDA’s 3-gram figure is a safety-context number for consumption without food, not a cooking recommendation. Choose a dose, record it in grams, and report it. The result is specific to that dose.
Does the crust change the detection threshold?
No retrieved source measures glutamate detectability on a seared beef crust. The published literature uses aqueous solutions. The crust introduces fat, Maillard products, salt, and texture variation that the solution-based method does not model. This is an open question, not a settled one.
Is MSG safe?
The FDA considers the addition of MSG to foods to be GRAS. The agency notes that studies with self-identified sensitive individuals have not consistently triggered reactions, and that a FASEB report identified transient symptoms in some sensitive individuals at 3 grams or more without food. A typical serving of food with added MSG contains less than 0.5 grams.
What if I can’t taste the difference?
That is a result. It means that under your conditions, at your dose, on your steak, you did not discriminate above chance. It does not mean MSG has no effect on anyone, and it does not mean your palate is defective. The literature documents a substantial subgroup with reduced or complete inability to discriminate isomolar MSG from NaCl.
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