COVID-19 can directly damage the cells responsible for detecting flavor, and for roughly four in ten people who test positive, some degree of taste dysfunction follows. The virus does not merely rob you of your sense of smell and let taste get caught in the crossfire; research now shows it attacks taste-sensing cells on their own terms. Most people recover within a few months, but a meaningful minority deal with distorted or absent taste for half a year or longer, and the ripple effects on diet, safety, and mental health are real.
Taste Loss Is Not Just Smell Loss in Disguise
For years, the default assumption was that people who said they had “lost their taste” to COVID were really describing smell loss. That assumption was reasonable on its face: much of what we call flavor is actually aroma reaching receptors in the nose from the back of the throat. But a large global study tested this directly by having COVID-positive participants rate the intensity of purely taste-based stimuli like salt and sugar, substances with essentially no odor component. Even after stripping out anything that could be confused with smell, participants with COVID still showed significantly reduced taste perception.
The study’s authors concluded that COVID-19-positive individuals report genuine taste dysfunction when tested with stimuli that have little to no smell involvement, confirming that the virus impairs the gustatory system independently.1PubMed Central. Covid-19 affects taste independent of taste-smell confusions: results from a combined chemosensory home test and online survey from a large global cohort A meta-analysis pooling data from nearly 139,000 COVID-positive patients estimated that about 39% experienced some form of taste dysfunction.2PubMed Central. Taste loss as a distinct symptom of COVID-19: A systematic review and meta-analysis That said, smell loss and taste loss frequently travel together, so separating one from the other requires careful testing rather than self-reports alone.
How the Virus Gets Into Taste Cells
SARS-CoV-2 enters human cells by latching onto a receptor protein called ACE2, with help from an enzyme called TMPRSS2 that primes the virus for entry. Both of these proteins show up in oral tissues. Researchers found ACE2 on a specific subset of taste receptor cells, the Type II cells that detect sweet, bitter, and umami flavors, inside taste buds on the tongue.3PubMed Central. Human Taste Cells Express ACE2: a Portal for SARS-CoV-2 Infection A separate study confirmed strong expression of both ACE2 and TMPRSS2 in the tongue’s taste buds and the surrounding tissues of the mouth lining.4PubMed. ACE2 and TMPRSS2 immunolocalization and oral manifestations of COVID-19 These entry factors also appear in the salivary glands.5Japanese Dental Science Review. Pathogenesis of taste impairment and salivary dysfunction in COVID-19 patients
So the virus essentially has multiple doors into the taste system. It can infect the taste receptor cells directly, damage the salivary glands that keep the tongue moist and help dissolve food chemicals for tasting, and potentially reach the nerves that carry taste signals to the brain. Researchers have documented all three of the key viral entry proteins in the glossopharyngeal and vagus nerves, the cranial nerves responsible for relaying taste information from the back of the tongue and throat to the brainstem.6EBioMedicine. SARS-CoV-2 entry sites are present in all structural elements of the human glossopharyngeal and vagal nerves: Clinical implications The infection can therefore disrupt taste at the receptor level, the saliva level, or the nerve-signaling level, and often a combination of all three.
The Saliva Connection
Dry mouth is an underappreciated piece of this puzzle. Saliva does more than keep your mouth comfortable; it dissolves and transports the chemical compounds in food so they can actually reach your taste receptors. A significant number of COVID patients develop reduced saliva flow alongside their taste problems.7PubMed Central. Treatments of COVID-19-Associated Taste and Saliva Secretory Disorders When your mouth is dry, even foods with strong flavors can taste muted because the tastants never dissolve properly onto the tongue surface. In post-COVID patients, dry mouth was reported at notably higher rates than in unaffected controls.8PubMed Central. Post-COVID-19 patients suffer from chemosensory, trigeminal, and salivary dysfunctions If you are recovering from COVID and your food tastes flat, part of the explanation may be that your salivary glands have not fully bounced back.
What COVID Taste Changes Actually Feel Like
Taste disruption from COVID is not a single experience. Some people lose taste entirely. Others keep some sensitivity but at reduced levels, like listening to music with the volume turned way down. And a third group develops distorted taste, where foods take on flavors that were never there before.
Among post-COVID patients reporting distorted taste, over half described a persistent metallic flavor, about one in five tasted bitterness, and a smaller group reported rotten or harsh sensations.8PubMed Central. Post-COVID-19 patients suffer from chemosensory, trigeminal, and salivary dysfunctions These distortions can be harder to live with than total loss because the unpleasant phantom flavors make eating actively aversive rather than just bland. Research also suggests that disease severity plays a role in which taste qualities get hit hardest. One study found that perception of umami, bitter, and sweet differed significantly between patients with moderate versus mild infections, while sour and salty perception stayed roughly similar across severity levels.9PubMed Central. Evaluation of qualitative and quantitative taste alterations in COVID-19
Self-Report Versus Objective Testing
There is a meaningful gap between what people say about their taste and what testing shows. In one prospective study, patients who reported taste loss were given standardized gustatory testing at the time of their complaints. Only about a quarter of those who said they had taste dysfunction actually showed measurable impairment on the test.10PubMed Central. Objective gustatory and olfactory dysfunction in COVID-19 patients: a prospective cross-sectional study That does not mean the rest were imagining things. The likely explanation goes back to the taste-smell confusion: many of those patients genuinely experienced a loss of flavor richness, but the problem was primarily in their olfactory system, not their gustatory one. The practical upshot is that if your food tastes wrong after COVID, a formal evaluation can help determine whether the issue is taste, smell, or both, and that distinction matters for choosing the right recovery approach.
Omicron Changed the Picture
If you caught COVID during the Omicron wave and did not lose your taste, you are not unusual. An analysis of routine contact-tracing data in England found that loss of smell or taste was far less common with Omicron infections compared to Delta, with roughly a fourfold drop in the odds of experiencing these symptoms.11PubMed Central. Comparative symptomatology of infection with SARS-CoV-2 variants Omicron (B.1.1.529) and Delta (B.1.617.2) from routine contact tracing data in England The reason is not fully settled, but Omicron’s mutations shifted its cellular tropism, making it more likely to infect the upper airways and less efficient at entering certain cell types deeper in the mouth and nose. Taste and smell loss were hallmark symptoms of the original strain and Delta; they became much less characteristic of later variants. That said, “less common” is not “gone.” People still develop taste problems from newer variants, just at lower rates.
How COVID Compares to Flu
Respiratory viruses in general can sometimes affect taste and smell, so a fair question is whether COVID is genuinely worse. The answer is yes, by a wide margin. A large matched comparison found that the three-month incidence of smell and taste disorders was roughly eleven times higher after COVID-19 than after influenza. The overall rates were small in absolute terms, about 0.73% for COVID versus 0.1% for flu in this dataset, but those figures reflect diagnosed cases captured in medical records and likely undercount the true burden. The relative difference is what matters: COVID-19 hits the chemosensory system much harder than seasonal flu.
Recovery Timelines
The good news is that most people get their taste back. A systematic review of early pandemic data found that improvement generally begins within the first week, with significant recovery by two weeks, though about a third of patients still had symptoms at the seven-day mark even after otherwise recovering from the illness.12PubMed Central. Onset and duration of symptoms of loss of smell/taste in patients with COVID-19: A systematic review
A larger meta-analysis using recovery-curve modeling offered a more detailed picture. By 30 days, roughly four in five patients had recovered their sense of taste. By 90 days, about nine in ten had. By six months, recovery reached roughly 98%.13PubMed. Prognosis and persistence of smell and taste dysfunction in patients with covid-19: meta-analysis with parametric cure modelling of recovery curves That leaves an estimated 4 to 5% who may develop persistent taste dysfunction that does not fully resolve on its own. Smell recovery followed a similar but slightly slower trajectory, reaching about 96% by the six-month mark. If you are still struggling at the three-month point, you are not in a tiny minority, and there are treatments worth trying.
Why Some People Are Hit Harder
Genetics plays a role. A genome-wide study involving nearly 70,000 participants identified a region on chromosome 4 associated with COVID-related loss of smell or taste. The relevant genes, UGT2A1 and UGT2A2, are involved in metabolizing odorants and tastants in the mucous membranes of the nose and mouth. People carrying a particular variant at this locus had modestly higher odds of losing their sense of taste or smell after infection.14Nature Genetics. The UGT2A1/UGT2A2 locus is associated with COVID-19-related loss of smell or taste The effect size was small, around 11% increased odds per copy of the risk allele, but it helps explain why two people with the same variant and similar illness severity can have completely different taste experiences.
Age and sex also seem to matter, though the patterns are less clear-cut. Women appear to report chemosensory loss more frequently in most studies, though it is debated whether they are actually more affected or simply more attuned to detecting changes. Among children, one study found that smell and taste loss was the second most common COVID symptom after fever, affecting about 44% of pediatric cases. Half of the children with reduced taste or smell lost at least five kilograms during their illness, and a quarter still had not returned to their pre-illness level of smell at follow-up.
Treatments and What the Evidence Says
No single treatment has been proven to reliably restore COVID-damaged taste, and any honest discussion of the options needs to start there. That said, several approaches show enough promise to be worth knowing about.
Olfactory training, the practice of deliberately sniffing a set of strong scents twice a day for several months, has become the most widely recommended rehabilitation strategy. It was originally developed for post-viral smell loss long before COVID and works by encouraging neural regeneration in the olfactory system. A structured rehabilitation program combining smell and taste training in children showed a significantly greater improvement in smell scores for the treatment group compared to controls. Taste strip scores, however, did not improve significantly more in the trained group.15PubMed Central. Outcomes of a Structured Olfactory and Gustatory Rehabilitation Program in Children with Post-COVID-19 Smell and Taste Disturbances This is a pattern seen across much of the literature: smell training helps smell more reliably than it helps taste, likely because the two senses recover through different pathways.
On the medication side, a combination of oral zinc and the steroid prednisolone was tested in long-COVID patients with persistent loss. After two to four months of treatment, gustatory function had improved to the point where only about 17% of retested patients still showed impaired taste, compared to a much higher share who remained impaired for smell. The study’s authors noted meaningful limitations, including a high dropout rate and no untreated control group, making it impossible to separate the drug effect from natural recovery.16PubMed Central. Effect of oral zinc and steroids on long COVID hyposmia and hypogeusia The broader research picture remains the same: steroids and olfactory training are the most commonly used approaches, but robust controlled trials are still needed.
Everyday Coping While You Wait
Recovery can take weeks or months, and in the meantime, eating still has to happen. Some strategies that people and researchers have found helpful go beyond just “wait it out.”
- Lean on texture: Firmer, crunchier foods stimulate the trigeminal nerve, which handles sensations like crunch, heat, and cooling. That nerve pathway is largely spared by COVID, so textural contrast can make eating more engaging even when flavor is muted.17Trends in Food Science & Technology. Olfactory and gustatory disorders caused by COVID-19: How to regain the pleasure of eating?
- Use temperature and spice: Very cold foods, very warm foods, and spicy ingredients like chili, ginger, and mint all activate the trigeminal system rather than taste receptors alone. They can add interest to meals that otherwise taste like nothing.
- Play with color and presentation: Research suggests that more vibrant visual presentation of food can modulate brain responses related to eating pleasure, partly compensating for the missing taste and smell signals.17Trends in Food Science & Technology. Olfactory and gustatory disorders caused by COVID-19: How to regain the pleasure of eating?
- Stay hydrated and manage dry mouth: Sipping water throughout meals, chewing sugar-free gum, and using saliva substitutes can help if reduced salivation is part of the problem.
- Watch your salt and sugar: When food tastes flat, a natural impulse is to pile on salt or sugar. This can quietly push your intake into unhealthy territory, raising cardiovascular and metabolic risks, especially if the dysfunction drags on for months.18PubMed Central. COVID-19 loss of smell and taste: potential psychological repercussions
Safety Risks Most People Overlook
The conversation about taste and smell loss often focuses on quality of life and misses a concrete safety dimension. When your chemical senses are impaired, you lose early warning systems. One study of people with COVID-related chemosensory dysfunction found that over 57% had experienced at least one safety-related event, and about 36% had experienced two or more. The most common issue, reported by 45% of participants, was being unable to smell smoke that others could perceive. Expired food, gas leaks, and chemical fumes are other hazards that become harder to detect. If you are living with reduced taste or smell, basic precautions like installing fresh smoke and gas detector batteries, checking food expiration dates visually, and asking others to sniff-test questionable items become more important than usual.
Mental Health and Eating Behavior
Persistent taste distortion affects people psychologically in ways that get underestimated. Food is social. Sharing meals is one of the most basic human rituals, and when eating becomes unpleasant or pointless, people often withdraw from situations built around it. Long-term taste dysfunction has been linked to decreased appetite, social isolation, and depressive symptoms.18PubMed Central. COVID-19 loss of smell and taste: potential psychological repercussions
The effects on children deserve particular attention. In a study of pediatric long-COVID patients with smell and taste dysfunction, 25% of those with these symptoms developed restrictive eating behavior, and five out of six of those children met clinical criteria for anorexia nervosa. None of the long-COVID patients without taste and smell problems developed eating difficulties.19PubMed Central. Development of restrictive eating disorders in children and adolescents with long-COVID-associated smell and taste dysfunction The affected children reported reduced appetite, symptoms of depression, no longer enjoying food, and feeling misunderstood by family and friends. Depressive symptoms and anxiety were significantly more common in the group that developed disordered eating.19PubMed Central. Development of restrictive eating disorders in children and adolescents with long-COVID-associated smell and taste dysfunction If a child who had COVID starts refusing food or losing weight, the connection to lingering taste dysfunction is worth investigating rather than assuming the eating problem is purely behavioral.
In older adults, the picture carries its own risks. A decline in taste and smell combined with depression and social withdrawal can feed into what geriatric medicine calls “anorexia of aging,” leading to protein malnutrition and physical deterioration. For someone already at risk of these problems, a bout of COVID that knocks out taste for months can tip the balance in a serious way.