Question 1

Why do people taste things so differently, and what is a supertaster?

Accepted Answer

Because taste perception varies **genetically, anatomically and by experience** — and the differences are large enough that two people eating the same thing can be having substantially different experiences rather than disagreeing about the same one.

**The supertaster finding.** A proportion of people are unusually sensitive to bitter compounds, identified through their response to **PROP** and **PTC**, chemicals related to those in brassicas. Populations divide roughly into **non-tasters, tasters and supertasters**, with supertasters commonly estimated at around a quarter, varying by population.

**What underlies it:**

**The TAS2R38 gene**, which codes a bitter receptor. Different variants produce markedly different sensitivity, and this is one of the clearest single-gene effects on everyday perception.

**Fungiform papillae density.** Supertasters tend to have more taste papillae on the tongue — the anatomical correlate, countable under magnification.

**What supertasters actually experience:** stronger bitterness from brassicas, coffee, dark chocolate, grapefruit, olives, tonic water and some beers; greater sensitivity to **capsaicin**, alcohol burn and fat texture — because these are partly trigeminal sensations that also intensify; and frequently a narrower range of foods enjoyed.

**It is not an advantage.** Supertasters are not better tasters — they experience **more intensity**, which can be unpleasant, and the trade-off is real. Some evidence associates the trait with lower vegetable consumption.

**The other sources of variation, which matter as much:**

**Coriander and the OR6A2 gene**, where a variant makes the herb taste of soap, since the same aldehydes occur in soap.

**Asparagus**, where variation exists in both producing the odorous compounds and in being able to smell them.

**Smell dominates flavour**, and olfactory receptor genes vary enormously between individuals — with substantially more variation than taste genes.

**Experience and exposure**, which shift preference strongly over time, particularly for bitter and spicy food.

**Age**, since taste and smell decline gradually from middle age.

**Saliva composition**, which affects how compounds reach receptors.

**The practical implication:** disagreements about food are frequently not matters of taste in the metaphorical sense but literally different sensory input.

Question 2

Why does food taste different as you get older?

Accepted Answer

Because smell declines substantially with age and taste declines modestly — and since most of what we call flavour is smell, the loss is far larger than it feels like from the inside. What actually

Question 3

Why does food taste bland when you have a cold?

Accepted Answer

Because most of what you experience as flavour is actually smell, and a blocked nose removes it. The tongue does very little of the work. Taste receptors detect only five basic qualities: sweet,

Question 4

Why does salt make sweet things taste sweeter?

Accepted Answer

Partly because sodium suppresses bitterness, and partly because salt affects how the tongue's receptors respond — the net effect is that sweetness comes forward. Two mechanisms are involved. The

Question 5

Why does coriander taste like soap to some people?

Accepted Answer

Because of genetics, and specifically because of how some people's olfactory receptors detect a group of chemicals that coriander shares with soap. Fresh coriander leaves — sold as cilantro in North

Question 6

Is MSG actually bad for you?

Accepted Answer

The scientific consensus is that MSG is safe for the general population at normal dietary levels, and the reputation it acquired has not held up under testing. What it is. Monosodium glutamate is the

Question 7

What is umami?

Accepted Answer

Umami is the fifth basic taste, alongside sweet, sour, salty and bitter. It is the savoury, mouth-filling quality of parmesan, soy sauce, anchovies, mushrooms, ripe tomatoes and cured meat. It was

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