Predict your baby bitter taste sensitivity (supertaster, medium taster, or non-taster) based on parental TAS2R38 gene PAV and AVI haplotype inheritance models.
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⚠️ Educational only. Probability estimates based on genetic models, not medical advice.
Women are statistically more likely to be supertasters than men, partly due to oestrogen effects on taste bud density and sensitivity. Research has found that supertasters have significantly more taste buds per square centimetre of tongue than non-tasters, with supertasters having roughly 4 times as many fungiform papillae (the mushroom-shaped structures housing taste buds) as non-tasters.
Sensitivity to bitter compounds is primarily controlled by the TAS2R38 gene, which encodes a taste receptor protein in the taste bud cells of the tongue. The gene has two main haplotypes: PAV (associated with supertasting) and AVI (associated with non-tasting). The PAV haplotype is dominant over AVI.
The TAS2R38 gene has three key single nucleotide polymorphisms (SNPs) at positions 145, 785, and 886. The combination of amino acids at these positions defines two main haplotypes: PAV (proline-alanine-valine) and AVI (alanine-valine-isoleucine). PAV produces a functional receptor highly sensitive to bitter compounds including PTC (phenylthiocarbamide) and PROP. AVI produces a non-functional receptor.
Supertasters (PAV/PAV) have two PAV alleles and the strongest bitter sensitivity. Medium tasters (PAV/AVI) have one of each and show intermediate sensitivity. Non-tasters (AVI/AVI) have two AVI alleles and cannot taste PTC or PROP at all. Approximately 25 percent of people are supertasters, 50 percent are medium tasters, and 25 percent are non-tasters, though frequencies vary by population.
TAS2R38 is the most studied bitter taste gene, but humans have 25 different TAS2R genes encoding different bitter taste receptors. Each receptor detects different bitter compounds. A supertaster for TAS2R38 compounds may not be a supertaster for all bitter foods. Sensitivity to the bitterness of beer hops, for example, involves different TAS2R receptors from those mediating PROP and PTC sensitivity.
Supertasters tend to eat fewer bitter-tasting vegetables such as broccoli, cabbage, kale, and Brussels sprouts because these taste intensely bitter to them. They also typically consume less alcohol and coffee. Research has found that supertasters tend to have lower rates of some cancers, possibly because they consume more phytochemicals from tolerating bitter vegetables better when other flavouring is used. Supertasting is more common in women than men.
A supertaster is someone who is homozygous for the PAV haplotype of the TAS2R38 gene, meaning they have two copies of the highly sensitive bitter taste receptor. Supertasters experience bitter compounds such as PTC, PROP, caffeine, and glucosinolates in vegetables with significantly greater intensity than average. About 25 percent of people are supertasters. Women are more commonly supertasters than men, and the trait is more common in Asian and African populations than in European ones.
Yes. The classic test uses PROP (6-n-propylthiouracil) paper strips, which are available online or through science education suppliers. Supertasters find the strips intensely bitter, medium tasters find them mildly bitter, and non-tasters detect little or no bitterness. A simpler home indicator is sensitivity to the bitterness of black coffee, dark chocolate over 80 percent cacao, and raw broccoli: supertasters find these intensely bitter while non-tasters may not notice much bitterness at all.
Yes, substantially. Supertasters are statistically more likely to avoid bitter vegetables, black coffee, dark beer, and heavily hopped beverages. They tend to add more fat and salt to food, which can mask bitterness. Non-tasters often enjoy foods that supertasters find unpleasant, and are typically more adventurous with bitter flavours such as bitter melon, fenugreek, and Campari. These differences have measurable effects on dietary patterns and have been studied as potential influences on health outcomes.
No. Bitter taste sensitivity is a variation in taste receptor genetics that affects how strongly you perceive bitter flavours. It has no relationship to food allergies or sensitivities, which involve immune responses to specific food proteins. A supertaster who avoids broccoli is responding to a genetic taste perception difference, not an allergic or intolerance reaction. They could eat broccoli safely; they simply find the taste more aversive due to their receptor genetics.